/* BOKYR · 思维导图（版式库 25）。类名前缀 bk-。改了把 hugo.toml 的 params.assetVersion +1。
   结构：点阵画布 → 页头 → 导图（中间根节点、左右各一半枝、S 形细枝；≤700 变左侧竖主干）→ 枝卡（左茎右文）→ 图外问答 → 作者框 → 页脚。
   颜色：每根枝一个色（.is-red 身份 / .is-blue 安全 / .is-teal 资料 / .is-amber 支付 / .is-violet 偏好 / .is-slate 进阶 / .is-lime 注册 / .is-root 根），组件里只用 var(--c) 和 var(--c-soft)。 */
:root{
 --paper:#f2f3ee;--dot:#d3d7cb;--ink:#15171c;--ink2:#2d313a;--mute:#5d6370;--line:#dcdfd5;--card:#fff;
 --red:#e5484d;--blue:#3e63dd;--teal:#0f998c;--amber:#df7f0b;--violet:#8b4fc4;--slate:#78808e;--lime:#c3ec5c;--lime-ink:#6f9615;
 --gap:22px;--reach:64px;--tw:3px;--rr:16px;--r:14px;--trunk:#15171c;
 --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",system-ui,sans-serif;
 --mono:ui-monospace,"Cascadia Mono","SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
 color-scheme:light;
}
.is-red{--c:var(--red);--c-soft:#fde9e9;--c-ink:#b4252a}
.is-blue{--c:var(--blue);--c-soft:#e8edfd;--c-ink:#2a49b8}
.is-teal{--c:var(--teal);--c-soft:#ddf3f0;--c-ink:#0b7268}
.is-amber{--c:var(--amber);--c-soft:#fdf0db;--c-ink:#9a5600}
.is-violet{--c:var(--violet);--c-soft:#f1e8fa;--c-ink:#6a3399}
.is-slate{--c:var(--slate);--c-soft:#eceef1;--c-ink:#4f5664}
.is-lime{--c:#86b21f;--c-soft:#eef7d4;--c-ink:#56750d}
.is-root{--c:var(--ink);--c-soft:#e7e8eb;--c-ink:var(--ink)}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;color:var(--ink);font:16px/1.75 var(--font);background:radial-gradient(circle,var(--dot) 1px,transparent 1.3px) 0 0/24px 24px,var(--paper);overflow-wrap:break-word}
img{max-width:100%;height:auto;display:block}
main{flex:1 0 auto}
a{color:inherit}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px;border-radius:6px}
.bk-skip{position:absolute;left:-999px;top:8px;z-index:99;background:var(--ink);color:#fff;padding:8px 14px;border-radius:8px}
.bk-skip:focus{left:12px}

/* 页眉 */
.bk-top{background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);position:relative;z-index:20}
.bk-top-in{max-width:1180px;margin:0 auto;padding:10px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.bk-logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;letter-spacing:.2em;font-size:15px;min-height:44px}
.bk-mark{flex:none}
.bk-nav{display:flex;flex-wrap:wrap;gap:2px;justify-content:flex-end}
.bk-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;font-size:14px;color:var(--mute);text-decoration:none;border-radius:999px}
.bk-nav a:hover{color:var(--ink);background:#f0f1ec}
.bk-nav a[aria-current="page"]{color:var(--ink);font-weight:700}

/* 页头 */
.bk-doc{padding-bottom:20px}
.bk-crumbs{max-width:1180px;margin:0 auto;padding:16px 24px 0;list-style:none;display:flex;flex-wrap:wrap;gap:6px;font-size:13px;color:var(--mute)}
.bk-crumbs li+li::before{content:"›";margin-right:6px;color:#a3a89d}
.bk-crumbs a{text-decoration:none}
.bk-crumbs a:hover{text-decoration:underline}
.bk-hero{max-width:1180px;margin:0 auto;padding:24px 24px 4px}
.bk-eye{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;margin:0 0 10px;font-size:13px;color:var(--mute)}
.bk-eye b{background:var(--ink);color:var(--lime);font:700 12px/1 var(--mono);letter-spacing:.12em;padding:6px 10px;border-radius:999px}
.bk-eye a{text-decoration:none;border-bottom:1px solid #b9bdb2}
.bk-hero h1{margin:0;font-size:clamp(24px,3.3vw,40px);line-height:1.22;font-weight:850;letter-spacing:-.01em;max-width:980px;text-wrap:balance}
.bk-dek{margin:10px 0 0;max-width:740px;color:var(--mute);font-size:16px;line-height:1.7}
.bk-intro{margin:10px 0 0;max-width:760px;color:#3d424c;font-size:15px}
.bk-intro p{margin:0 0 8px}
.bk-legend{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;margin:14px 0 0;font-size:13px}
.bk-legend span{display:inline-flex;align-items:center;gap:6px;font-weight:700}
.bk-legend span::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--c);box-shadow:0 0 0 3px var(--c-soft)}
.bk-legend em{font-style:normal;color:var(--mute)}

/* ───── 导图（桌面 / 平板）───── */
.bk-map{max-width:1180px;margin:20px auto 0;padding:10px 24px 28px;display:grid;grid-template-columns:minmax(0,1fr) minmax(250px,310px) minmax(0,1fr);grid-template-areas:"l root r";column-gap:var(--reach);align-items:center;position:relative}
.bk-map.is-solo{grid-template-columns:minmax(0,440px);grid-template-areas:"root";justify-content:center}
.bk-col{list-style:none;margin:0;padding:0;display:grid;grid-auto-rows:1fr;row-gap:var(--gap);align-self:center}
.bk-col.is-l{grid-area:l}
.bk-col.is-r{grid-area:r}
.bk-node{position:relative;display:flex;min-width:0}
.bk-col.is-l .bk-node{justify-content:flex-end}
.bk-nd{position:relative;z-index:1;flex:0 1 360px;min-width:0;display:flex;flex-direction:column;gap:3px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px 15px 13px;text-decoration:none;color:inherit;box-shadow:0 1px 0 rgba(21,23,28,.04),0 14px 26px -20px rgba(21,23,28,.45);transition:transform .15s ease,box-shadow .15s ease}
.bk-col.is-l .bk-nd{border-right:6px solid var(--c)}
.bk-col.is-r .bk-nd{border-left:6px solid var(--c)}
.bk-nd:hover{transform:translateY(-2px);box-shadow:0 1px 0 rgba(21,23,28,.04),0 18px 30px -18px rgba(21,23,28,.5)}
.bk-nd-no{font:800 11px/1 var(--mono);letter-spacing:.1em;color:var(--c)}
.bk-nd-t{font-size:18px;line-height:1.3;font-weight:850}
.bk-nd-d{font:600 11px/1.2 var(--mono);color:var(--mute)}
.bk-nd-s{font-size:13px;line-height:1.5;color:var(--mute)}
.bk-nd-lv{display:flex;flex-wrap:wrap;gap:5px;margin-top:5px}
.bk-nd-lv i{font-style:normal;font-size:12px;line-height:1.5;padding:2px 9px;border-radius:999px;background:var(--c-soft);color:var(--c-ink)}
.bk-nd-g{display:flex;align-items:flex-start;gap:6px;margin-top:6px;padding-top:7px;border-top:1px dashed var(--line);font-size:12px;line-height:1.5;color:var(--ink2)}
.bk-nd-g::before{content:"";flex:none;width:11px;height:12px;margin-top:3px;border-radius:2px 2px 3px 3px;background:var(--c);box-shadow:0 -4px 0 -2px var(--card),0 -5px 0 -1px var(--c)}
.is-compact .bk-nd{padding:9px 13px 10px}
.is-compact .bk-nd-t{font-size:15.5px;font-weight:800}
.is-compact .bk-nd-lv{margin-top:3px}
.is-compact .bk-nd-lv i{font-size:11.5px;padding:1px 8px}

/* S 形细枝：从枝卡的内侧边中点出发，弯到列中线、接上根节点。--d = 离列中线几行，高 = d ×（行高 + 行距） */
.bk-twig{position:absolute;width:var(--reach);pointer-events:none;z-index:0}
.bk-col.is-l .bk-twig{left:100%}
.bk-col.is-r .bk-twig{right:100%}
.bk-twig.is-flat{top:50%;height:0;border-top:var(--tw) solid var(--c);margin-top:calc(var(--tw) / -2)}
.bk-twig.is-dn{top:50%;height:calc(var(--d) * (100% + var(--gap)))}
.bk-twig.is-up{bottom:50%;height:calc(var(--d) * (100% + var(--gap)))}
.bk-twig.is-dn::before,.bk-twig.is-dn::after,.bk-twig.is-up::before,.bk-twig.is-up::after{content:"";position:absolute;width:50%;height:50%;border:0 solid var(--c)}
.bk-col.is-l .bk-twig.is-dn::before{left:0;top:calc(var(--tw) / -2);border-top-width:var(--tw);border-right-width:var(--tw);border-top-right-radius:var(--rr)}
.bk-col.is-l .bk-twig.is-dn::after{left:calc(50% - var(--tw));width:calc(50% + var(--tw));bottom:calc(var(--tw) / -2);border-left-width:var(--tw);border-bottom-width:var(--tw);border-bottom-left-radius:var(--rr)}
.bk-col.is-l .bk-twig.is-up::before{left:0;bottom:calc(var(--tw) / -2);border-bottom-width:var(--tw);border-right-width:var(--tw);border-bottom-right-radius:var(--rr)}
.bk-col.is-l .bk-twig.is-up::after{left:calc(50% - var(--tw));width:calc(50% + var(--tw));top:calc(var(--tw) / -2);border-top-width:var(--tw);border-left-width:var(--tw);border-top-left-radius:var(--rr)}
.bk-col.is-r .bk-twig.is-dn::before{right:0;top:calc(var(--tw) / -2);border-top-width:var(--tw);border-left-width:var(--tw);border-top-left-radius:var(--rr)}
.bk-col.is-r .bk-twig.is-dn::after{right:calc(50% - var(--tw));width:calc(50% + var(--tw));bottom:calc(var(--tw) / -2);border-right-width:var(--tw);border-bottom-width:var(--tw);border-bottom-right-radius:var(--rr)}
.bk-col.is-r .bk-twig.is-up::before{right:0;bottom:calc(var(--tw) / -2);border-bottom-width:var(--tw);border-left-width:var(--tw);border-bottom-left-radius:var(--rr)}
.bk-col.is-r .bk-twig.is-up::after{right:calc(50% - var(--tw));width:calc(50% + var(--tw));top:calc(var(--tw) / -2);border-top-width:var(--tw);border-right-width:var(--tw);border-top-right-radius:var(--rr)}

/* 根节点 */
.bk-root{grid-area:root;position:relative;z-index:2;align-self:center;color:#eef0ea;background:radial-gradient(120% 70% at 50% 0%,#2a2f3a 0%,#181a20 55%,#111317 100%);border-radius:24px;padding:18px 18px 16px;box-shadow:0 30px 60px -30px rgba(17,19,23,.75),0 0 0 1px rgba(255,255,255,.05) inset,0 0 0 5px var(--paper),0 0 0 7px var(--c)}
.bk-root.is-root{--c:#2b2f38}
.bk-root-in{position:relative}
.bk-root-k{display:inline-block;margin:0 0 8px;font:800 11px/1 var(--mono);letter-spacing:.24em;color:#15171c;background:var(--lime);padding:5px 9px 5px 11px;border-radius:999px}
.bk-root-t{margin:0;display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 10px}
.bk-root-t b{font:900 36px/1 var(--mono);letter-spacing:.06em;color:var(--lime)}
.bk-is-art .bk-root-t b,.bk-is-list .bk-root-t b,.bk-is-plain .bk-root-t b,.bk-is-404 .bk-root-t b{font:850 20px/1.35 var(--font);letter-spacing:0;color:#fff}
.bk-root-t span{font-size:15px;font-weight:700;color:#f6f7f2}
.bk-root-s{margin:8px 0 0;font-size:13px;line-height:1.6;color:#c4c8cf}
.bk-root-go{display:inline-flex;align-items:center;gap:6px;min-height:44px;margin-top:6px;font-size:13px;color:var(--lime);text-decoration:none;font-weight:700}
.bk-root-go::after{content:"↓"}
.bk-map.is-broken .bk-root{background:repeating-linear-gradient(135deg,#1b1d23 0 12px,#20232a 12px 24px);box-shadow:0 0 0 2px #fff inset,0 0 0 5px var(--paper),0 0 0 7px transparent;outline:3px dashed #9aa0aa;outline-offset:4px}
.bk-map.is-broken .bk-root-go::after{content:"↗"}
.bk-map.is-broken .bk-twig{opacity:.55}
.bk-map.is-broken .bk-twig.is-dn::after,.bk-map.is-broken .bk-twig.is-up::after{border-style:dashed}

/* 码卡：桌面在根节点下半截 */
.bk-kit{margin:14px 0 0;padding:14px 0 0;border-top:1px dashed rgba(255,255,255,.22)}
.bk-kit-k{margin:0 0 8px;font-size:12px;color:#c4c8cf}
.bk-kit-row{display:flex;align-items:center;gap:10px;margin:0}
.bk-kit code{font:900 30px/1 var(--mono);letter-spacing:.12em;color:#fff}
.bk-copy{min-height:44px;padding:0 14px;border-radius:999px;border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.06);color:#fff;font:700 13px var(--font);cursor:pointer}
.bk-copy:hover{background:rgba(255,255,255,.14)}
.bk-copy.is-done{background:var(--lime);border-color:var(--lime);color:#15171c}
.bk-kit-gain{margin:10px 0 0;font-size:13.5px;font-weight:700;color:#f6f7f2;line-height:1.5}
.bk-kit-gain sup{color:var(--lime)}
.bk-go{display:flex;align-items:center;justify-content:center;min-height:48px;margin:12px 0 0;padding:0 14px;border-radius:14px;background:linear-gradient(180deg,#d2f575,#b5e043);color:#15171c;font-weight:850;font-size:15px;text-decoration:none;box-shadow:0 10px 22px -12px rgba(195,236,92,.8),0 -2px 0 rgba(0,0,0,.12) inset}
.bk-go::after{content:"↗";margin-left:8px;font-weight:700}
.bk-go:hover{filter:brightness(1.05)}
.bk-kit-mini{display:none}
.bk-kit-note{margin:10px 0 0;font-size:12px;line-height:1.6;color:#b8bcc4}
.bk-kit-star{margin:6px 0 0;font-size:11px;line-height:1.55;color:#9196a0}
.bk-kit.is-bare .bk-kit-gain{margin-bottom:2px}

/* ───── 枝卡 ───── */
.bk-cards{max-width:1180px;margin:30px auto 0;padding:0 24px;display:grid;gap:18px}
.bk-lead{max-width:800px;margin:0 0 4px;font-size:16.5px}
.bk-card{display:grid;grid-template-columns:232px minmax(0,1fr);background:var(--card);border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 22px 40px -36px rgba(21,23,28,.6)}
.bk-stem{position:relative;padding:22px 18px 20px 20px;background:linear-gradient(180deg,var(--c-soft) 0%,#fff 78%);border-right:1px solid var(--line)}
.bk-stem-in{position:sticky;top:18px}
.bk-stem-k{margin:0;display:flex;flex-direction:column;gap:4px}
.bk-stem-k span{align-self:flex-start;font:800 11px/1 var(--mono);letter-spacing:.14em;color:#fff;background:var(--c);padding:5px 9px;border-radius:999px}
.bk-stem-k b{font-size:26px;line-height:1.2;font-weight:900;color:var(--c-ink)}
.bk-twigs{list-style:none;margin:14px 0 0;padding:0 0 0 22px;position:relative}
.bk-twigs::before{content:"";position:absolute;left:5px;top:-8px;bottom:14px;width:2px;background:var(--c);border-radius:2px}
.bk-twigs li{position:relative;margin:0 0 6px}
.bk-twigs li::before{content:"";position:absolute;left:-17px;top:4px;width:14px;height:12px;border-left:2px solid var(--c);border-bottom:2px solid var(--c);border-bottom-left-radius:9px}
.bk-twigs a{display:inline-flex;align-items:center;min-height:40px;padding:3px 10px;font-size:13px;line-height:1.4;text-decoration:none;color:var(--ink2);background:#fff;border:1px solid var(--line);border-radius:10px}
.bk-twigs a:hover{border-color:var(--c);color:var(--c-ink)}
.bk-gate{margin:14px 0 0;padding:9px 11px;font-size:13px;line-height:1.55;background:#fff;border:1.5px dashed var(--c);border-radius:12px}
.bk-gate span{display:block;margin-bottom:2px;font-size:11px;font-weight:800;letter-spacing:.06em;color:var(--c-ink)}
.bk-up{display:inline-flex;align-items:center;gap:4px;min-height:44px;margin-top:10px;font-size:12px;color:var(--mute);text-decoration:none}
.bk-up::before{content:"↑"}
.bk-up:hover{color:var(--ink)}
.bk-card.is-rootcard .bk-stem{background:radial-gradient(130% 60% at 30% 0%,#2a2f3a,#15171c 70%);border-right-color:#15171c}
.bk-card.is-rootcard .bk-stem-k span{background:var(--lime);color:#15171c}
.bk-card.is-rootcard .bk-stem-k b{color:var(--lime);font-family:var(--mono);letter-spacing:.06em}
.bk-card.is-rootcard{--c:#2b2f38}
.bk-card.is-rootcard .bk-twigs::before,.bk-card.is-rootcard .bk-twigs li::before{border-color:var(--lime);background-color:var(--lime)}
.bk-card.is-rootcard .bk-twigs li::before{background:none}
.bk-card.is-rootcard .bk-up{color:#c4c8cf}
.bk-flesh{min-width:0;padding:24px 32px 26px}
.bk-cards.is-plain .bk-card{grid-template-columns:170px minmax(0,1fr)}
.bk-cards.is-plain .bk-stem-k b{font-size:20px}
.bk-flesh>.bk-h{margin:0 0 12px;font-size:clamp(20px,2.2vw,26px);line-height:1.32;font-weight:850;scroll-margin-top:18px}

/* 正文 */
.bk-body{font-size:16px;line-height:1.85;color:#262a32}
.bk-body>:first-child{margin-top:0}
.bk-body p{margin:0 0 13px}
.bk-body strong{font-weight:800;background:linear-gradient(transparent 62%,var(--c-soft,#eef7d4) 62%)}
.bk-body a{color:var(--c-ink,#2a49b8);text-decoration-thickness:1px;text-underline-offset:3px}
.bk-body h3,.bk-body .bk-h3{position:relative;margin:24px 0 8px;padding-left:18px;font-size:18px;line-height:1.45;font-weight:800;scroll-margin-top:18px}
.bk-body h3::before{content:"";position:absolute;left:0;top:.42em;width:10px;height:10px;border-radius:50% 50% 50% 2px;background:var(--c,var(--ink));transform:rotate(-45deg)}
.bk-body h4{margin:18px 0 6px;font-size:16px}
.bk-body ul,.bk-body ol{margin:0 0 14px;padding-left:1.4em}
.bk-body li{margin:0 0 6px}
.bk-body li::marker{color:var(--c,var(--ink))}
.bk-body code{font:600 .92em var(--mono);background:#f1f2ed;border-radius:5px;padding:1px 5px}
.bk-body blockquote{margin:0 0 14px;padding:10px 16px;border-left:4px solid var(--c,var(--ink));background:#f7f8f4;border-radius:0 12px 12px 0;color:#3d424c}
.bk-body hr{border:0;border-top:1px dashed var(--line);margin:20px 0}

/* 提示块 */
.bk-note{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;margin:16px 0;padding:12px 14px;border-radius:14px;background:#f7f8f4;border:1px solid var(--line)}
.bk-note-k{align-self:start;font:800 11px/1 var(--mono);letter-spacing:.12em;padding:6px 9px;border-radius:999px;color:#fff;background:var(--ink2)}
.bk-note.is-tip{background:#f3f7e6;border-color:#dce8bd}.bk-note.is-tip .bk-note-k{background:var(--lime-ink)}
.bk-note.is-warn{background:#fdf4e4;border-color:#f1dcb3}.bk-note.is-warn .bk-note-k{background:#b86a06}
.bk-note.is-stop{background:#fdecec;border-color:#f3c9ca}.bk-note.is-stop .bk-note-k{background:#c4373c}
.bk-note.is-ok{background:#e6f5f2;border-color:#bfe3dc}.bk-note.is-ok .bk-note-k{background:#0b7c71}
.bk-note-t{display:block;margin:0 0 2px;font-size:15px}
.bk-note .bk-body{font-size:15px;line-height:1.75}
.bk-note .bk-body p:last-child{margin-bottom:0}

/* 状态分流：一个小分叉 */
.bk-state{position:relative;display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:26px;margin:18px 0}
.bk-state::before{content:"";position:absolute;left:calc(45% - 2px);top:50%;width:26px;height:3px;background:var(--c,var(--ink));border-radius:2px}
.bk-state-say,.bk-state-do{position:relative;border-radius:16px;padding:12px 14px}
.bk-state-say{background:var(--ink);color:#eef0ea}
.bk-state-say p{margin:6px 0 0;font-weight:700;line-height:1.55}
.bk-state-do{background:#fff;border:1.5px solid var(--c,var(--ink))}
.bk-state-k{font:800 11px/1 var(--mono);letter-spacing:.12em;color:var(--lime)}
.bk-state-do .bk-state-k{color:var(--c-ink,var(--ink))}
.bk-state-cost{display:inline-block;margin-top:8px;font-size:12px;background:rgba(255,255,255,.12);border-radius:999px;padding:2px 10px}
.bk-state-do .bk-body{margin-top:6px;font-size:15px;line-height:1.75}
.bk-state-do .bk-body p:last-child{margin-bottom:0}

/* 表格（三列以上窄屏变卡片） */
.bk-tbl{margin:16px 0;overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:#fff}
.bk-tbl table{width:100%;border-collapse:collapse;font-size:14.5px;line-height:1.6}
.bk-tbl th{background:var(--c-soft,#eef0eb);color:var(--c-ink,var(--ink));text-align:left;font-weight:800;padding:10px 12px;white-space:nowrap}
.bk-tbl td{padding:10px 12px;border-top:1px solid #eceee8;vertical-align:top}

/* 步骤清单（= HowTo） */
.bk-steps{margin:18px 0;padding:14px 16px 16px;border-radius:18px;background:#f6f7f2;border:1px solid var(--line)}
.bk-steps-t{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:0}
.bk-steps-t b{font-size:16px}
.bk-steps-t span{font:700 12px var(--mono);color:var(--mute)}
.bk-steps-lead{margin:4px 0 0;font-size:14px;color:var(--mute)}
.bk-steps ol{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:8px}
.bk-steps li{display:grid;grid-template-columns:30px minmax(0,1fr) auto;gap:10px;align-items:start;margin:0;padding:10px 12px;background:#fff;border:1px solid var(--line);border-radius:14px}
.bk-steps-n{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:var(--lime);font:800 12px var(--mono)}
.bk-steps li b{display:block;font-size:15px;line-height:1.5}
.bk-steps li p{margin:2px 0 0;font-size:14px;line-height:1.65;color:#3d424c}
.bk-steps li a{align-self:center;display:inline-flex;align-items:center;min-height:44px;font-size:12px;white-space:nowrap;color:var(--mute)}

/* 依据 */
.bk-basis{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;margin:18px 0 0;padding:12px 14px;border-radius:14px;border:1px dashed #b9beb2;background:repeating-linear-gradient(-45deg,#fafbf7 0 8px,#f5f6f1 8px 16px)}
.bk-basis-k{font:800 11px/1 var(--mono);letter-spacing:.12em;padding:6px 9px;border-radius:999px;background:#fff;border:1px solid #c9cdc1;align-self:start}
.bk-basis .bk-body{font-size:14px;line-height:1.75;color:#3d424c}
.bk-basis .bk-body p:last-child{margin-bottom:0}

/* 截图 / 本站图 / 两图并排 */
.bk-shot,.bk-figure,.bk-cover{margin:18px 0}
.bk-shot-box{border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 20px 34px -28px rgba(21,23,28,.6)}
.bk-shot-bar{display:flex;align-items:center;gap:6px;padding:8px 12px;background:#eef0ea;border-bottom:1px solid var(--line)}
.bk-shot-bar i{width:9px;height:9px;border-radius:50%;background:#cfd3c8}
.bk-shot-bar em{margin-left:8px;font:600 11px var(--mono);font-style:normal;color:var(--mute);background:#fff;border-radius:999px;padding:2px 10px}
.bk-shot.is-phone .bk-shot-box{max-width:300px;margin:0 auto;border-radius:30px;border:8px solid #1d2027}
.bk-shot figcaption,.bk-figure figcaption,.bk-cover figcaption,.bk-scr figcaption,.bk-uid figcaption{margin:8px auto 0;font-size:13px;line-height:1.6;color:var(--mute);text-align:center;max-width:560px}
.bk-figure img,.bk-cover img{border-radius:14px;border:1px solid var(--line)}
.bk-cover{max-width:1180px;margin:8px auto 0;padding:0 24px}
.bk-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start;margin:18px 0}
.bk-pair>figure{margin:0}

/* 界面示意（scr）：手机屏 / 浏览器窗口，要点的那一行点亮 */
.bk-scr{margin:18px 0;display:flex;flex-direction:column;align-items:center}
.bk-scr-dev{width:min(100%,290px);padding:9px;border-radius:30px;background:linear-gradient(155deg,#343945 0%,#16181d 60%);box-shadow:0 26px 40px -24px rgba(21,23,28,.6),0 0 0 1px rgba(0,0,0,.25)}
.bk-scr.is-web .bk-scr-dev{width:min(100%,420px);padding:0;border-radius:14px;background:#dfe2da}
.bk-scr-in{overflow:hidden;border-radius:22px;padding:0 0 12px;background:linear-gradient(180deg,#fcfcf9 0%,#eff1ea 100%)}
.bk-scr.is-web .bk-scr-in{border-radius:0 0 14px 14px}
.bk-scr-notch{margin:0;padding:7px 0 2px;display:flex;justify-content:center}
.bk-scr-notch i{width:64px;height:6px;border-radius:9px;background:#d5d8cf}
.bk-scr-bar{margin:0;display:flex;align-items:center;gap:6px;padding:8px 12px;background:#e7e9e2;border-radius:14px 14px 0 0}
.bk-scr-bar i{width:9px;height:9px;border-radius:50%;background:#c6cabf}
.bk-scr-bar i:first-child{background:#ef8c8f}
.bk-scr-bar em{margin-left:8px;font:600 11px var(--mono);font-style:normal;color:#565c66;background:#fff;border-radius:999px;padding:2px 10px}
.bk-scr-top{margin:0;display:flex;align-items:center;gap:9px;padding:10px 14px 8px;font-size:14px}
.bk-scr-top b{font-weight:850}
.bk-scr-top span{margin-left:auto;width:34px;height:8px;border-radius:9px;background:#dcdfd6}
.bk-scr-av{width:28px;height:28px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff 0 18%,transparent 19%),linear-gradient(140deg,var(--c),#2d313a);box-shadow:0 0 0 3px #fff}
.bk-scr-crumb{margin:0 14px 8px;font:600 11px/1.5 var(--mono);color:var(--mute)}
.bk-scr-rows{list-style:none;margin:0 10px;padding:0;overflow:hidden;background:#fff;border-radius:16px;box-shadow:0 1px 0 rgba(0,0,0,.04),0 10px 18px -16px rgba(21,23,28,.5)}
.bk-scr-rows li{position:relative;display:flex;align-items:center;gap:10px;margin:0;padding:10px 12px;font-size:13.5px;line-height:1.4;color:#30343d}
.bk-scr-rows li+li{border-top:1px solid #eef0ea}
.bk-scr-rows li i{flex:none;width:22px;height:22px;border-radius:7px;background:linear-gradient(140deg,#e4e7df,#cdd1c6)}
.bk-scr-rows li em{margin-left:auto;font-style:normal;color:#a8ada3}
.bk-scr-rows li.is-hi{background:linear-gradient(90deg,var(--c-soft),#fff);font-weight:800;color:var(--c-ink);box-shadow:inset 4px 0 0 var(--c)}
.bk-scr-rows li.is-hi i{background:linear-gradient(140deg,var(--c),#15171c);box-shadow:0 4px 10px -4px var(--c)}
.bk-scr-rows li s{margin-left:auto;text-decoration:none;font-size:11px;font-weight:800;color:#fff;background:var(--c);border-radius:999px;padding:2px 9px;box-shadow:0 6px 12px -6px var(--c)}

/* UID 在哪：官网 + App 两块示意 */
.bk-uid{margin:18px 0}
.bk-uid-row{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);gap:18px;align-items:end}
.bk-uid.is-web .bk-uid-row,.bk-uid.is-app .bk-uid-row{grid-template-columns:minmax(0,420px);justify-content:center}
.bk-uid-web,.bk-uid-app{position:relative;min-width:0}
.bk-uid-web>div{position:relative;min-height:236px;overflow:hidden;border-radius:14px;background:linear-gradient(180deg,#fcfcf9,#eff1ea);box-shadow:0 26px 40px -26px rgba(21,23,28,.6),0 0 0 1px #d6d9cf;padding-bottom:16px}
.bk-uid-nav{margin:0;display:flex;align-items:center;gap:10px;padding:10px 14px;background:#15171c}
.bk-uid-logo{width:22px;height:22px;border-radius:6px;background:linear-gradient(135deg,#f5d24a,#d9a514);transform:rotate(45deg) scale(.78)}
.bk-uid-nav span{height:8px;width:46px;border-radius:9px;background:#3a3f4a}
.bk-uid-av{margin-left:auto;width:26px;height:26px;border-radius:50%;background:radial-gradient(circle at 50% 38%,#fff 0 22%,transparent 23%),radial-gradient(circle at 50% 110%,#fff 0 45%,transparent 46%),#6c7280;box-shadow:0 0 0 3px var(--lime)}
.bk-uid-drop{list-style:none;position:absolute;right:12px;top:82px;z-index:2;margin:0;padding:6px;width:140px;background:#fff;border-radius:12px;box-shadow:0 18px 30px -14px rgba(21,23,28,.55),0 0 0 1px #e1e4dc}
.bk-uid-drop li{display:flex;align-items:center;justify-content:space-between;margin:0;padding:6px 9px;font-size:12.5px;border-radius:8px;color:#4a4f59}
.bk-uid-drop li.is-hi{background:#eef7d4;color:#3f5a07;font-weight:800}
.bk-uid-drop s,.bk-uid-line s,.bk-uid-head s{text-decoration:none;font-size:13px;font-weight:900;color:#56750d}
.bk-uid-page{display:flex;align-items:center;gap:12px;margin:18px 168px 0 16px;padding:12px;background:#fff;border-radius:14px;box-shadow:0 1px 0 rgba(0,0,0,.04)}
.bk-uid-face{flex:none;width:40px;height:40px;border-radius:50%;background:radial-gradient(circle at 50% 38%,#fff 0 20%,transparent 21%),radial-gradient(circle at 50% 108%,#fff 0 42%,transparent 43%),linear-gradient(140deg,#8b93a3,#4a505c)}
.bk-uid-line{margin:0;display:flex;align-items:center;gap:8px;white-space:nowrap;padding:5px 9px;border-radius:9px;background:#eef7d4;box-shadow:inset 0 0 0 1.5px #a9d23c;font-size:12px}
.bk-uid-line b{font:800 11px var(--mono);letter-spacing:.06em;color:#3f5a07}
.bk-uid-line code{font:700 12px var(--mono);color:#30343d;letter-spacing:.02em}
.bk-uid-nick{margin:6px 0 0;height:8px;width:90px;border-radius:9px;background:#dfe2da;font-size:12px}
.bk-uid-app>div{width:min(100%,250px);margin:0 auto;padding:9px;border-radius:30px;background:linear-gradient(155deg,#343945 0%,#16181d 60%);box-shadow:0 26px 40px -24px rgba(21,23,28,.6)}
.bk-uid-scr{overflow:hidden;border-radius:22px;background:linear-gradient(180deg,#fcfcf9,#eff1ea)}
.bk-uid-head{margin:0;display:flex;align-items:center;gap:8px;padding:8px 12px}
.bk-uid-head .bk-uid-av{margin-left:0;width:26px;height:26px}
.bk-uid-head span{margin-left:auto;width:60px;height:8px;border-radius:9px;background:#dfe2da}
.bk-uid-card{display:flex;align-items:center;gap:10px;margin:0 10px;padding:12px;background:#fff;border-radius:16px;box-shadow:0 10px 18px -16px rgba(21,23,28,.5)}
.bk-uid-card .bk-uid-nick{height:auto;width:auto;background:none;color:#30343d;font-weight:800;font-size:13px;margin:5px 0 0 2px}
.bk-uid-card .bk-uid-line{padding:4px 8px}
.bk-uid-menu{list-style:none;margin:0;padding:10px 12px 12px}
.bk-uid-menu li{height:30px;margin:0 0 6px;border-radius:10px;background:#fff;box-shadow:0 1px 0 rgba(0,0,0,.04)}

/* 图外问答 */
.bk-out{max-width:1180px;margin:44px auto 0;padding:0 24px;position:relative}
.bk-out-top{position:relative;padding-left:58px;margin-bottom:16px}
.bk-out-top::before{content:"";position:absolute;left:18px;top:-36px;width:26px;height:58px;border-left:3px dashed #a0a69b;border-bottom:3px dashed #a0a69b;border-bottom-left-radius:18px}
.bk-out-k{display:flex;align-items:center;gap:10px;margin:0 0 4px;font-size:13px;color:var(--mute)}
.bk-out-k span{font:800 11px/1 var(--mono);letter-spacing:.2em;background:#fff;border:1.5px dashed #8d9388;padding:5px 9px;border-radius:999px;color:var(--ink)}
.bk-out h2{margin:0;font-size:clamp(22px,2.6vw,30px);font-weight:900}
.bk-out-lead{margin:6px 0 0;color:var(--mute);font-size:15px;max-width:720px}
.bk-qas{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.bk-qa{position:relative;padding:16px 18px 16px 60px;background:#fff;border:1px solid var(--line);border-radius:22px 22px 22px 6px;box-shadow:0 18px 30px -30px rgba(21,23,28,.6)}
.bk-qn{position:absolute;left:16px;top:16px;width:30px;height:30px;display:grid;place-items:center;border-radius:50% 50% 50% 6px;background:var(--lime);color:#15171c;font:800 12px var(--mono)}
.bk-q{margin:0 0 6px;font-size:16.5px;line-height:1.45;font-weight:800}
.bk-a{margin:0;font-size:15px;line-height:1.8;color:#363b45}

/* 旁枝 / 新长出的叶子 */
.bk-side{max-width:1180px;margin:40px auto 0;padding:0 24px}
.bk-sec-top{margin-bottom:14px}
.bk-kick{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 4px;font-size:13px;color:var(--mute)}
.bk-kick b{font:800 11px/1 var(--mono);letter-spacing:.14em;color:var(--lime);background:var(--ink);padding:6px 10px;border-radius:999px}
.bk-sec-top h2{margin:0;font-size:clamp(20px,2.3vw,26px);font-weight:900}
.bk-side-row{position:relative;list-style:none;margin:0;padding:22px 0 0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.bk-side-row.is-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.bk-side-row::before{content:"";position:absolute;left:8%;right:8%;top:0;height:3px;background:#c5cabd;border-radius:2px}
.bk-sleaf{position:relative;margin:0}
.bk-sleaf::before{content:"";position:absolute;left:50%;top:-22px;width:3px;height:22px;background:var(--c)}
.bk-sleaf a{display:flex;flex-direction:column;gap:4px;height:100%;padding:13px 15px;background:#fff;border:1px solid var(--line);border-top:5px solid var(--c);border-radius:16px;text-decoration:none;box-shadow:0 16px 28px -26px rgba(21,23,28,.6)}
.bk-sleaf b{font-size:15.5px;line-height:1.45}
.bk-sleaf span{font-size:13px;line-height:1.6;color:var(--mute)}
.bk-sleaf em{margin-top:auto;font:600 11px var(--mono);font-style:normal;color:var(--c-ink)}
.bk-all{margin:14px 0 0}
.bk-all a{display:inline-flex;align-items:center;min-height:44px;font-weight:800;text-decoration:none;border-bottom:2px solid var(--lime-ink)}

/* 标签条 */
.bk-tags{max-width:1180px;margin:30px auto 0;padding:0 24px;display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.bk-tags-h{font-size:13px;color:var(--mute);margin-right:4px}
.bk-tags a,.bk-tag-plain{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 13px;border-radius:999px;font-size:13.5px;text-decoration:none}
.bk-tags a{background:#fff;border:1.5px solid var(--c);color:var(--c-ink);font-weight:700}
.bk-tags a::before,.bk-tag-plain::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--c)}
.bk-tag-plain{border:1.5px dashed #b4b9ad;color:var(--mute);background:transparent}

/* 作者框 */
.bk-author{max-width:1180px;margin:40px auto 0;padding:0 24px}
.bk-author>*{max-width:820px}
.bk-author-n{display:flex;align-items:center;gap:10px;margin:0 0 6px}
.bk-author-n i{width:36px;height:36px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:var(--lime);font-style:normal;font-weight:900}
.bk-author-n span{font-size:13px;color:var(--mute)}
.bk-author p{margin:0 0 6px;font-size:14px;line-height:1.75;color:#3d424c}
.bk-author-l{display:flex;flex-wrap:wrap;gap:4px 16px}
.bk-author-l a{display:inline-flex;align-items:center;min-height:44px;font-size:13px}

/* 翻页 */
.bk-pager{max-width:1180px;margin:0 auto;padding:4px 24px 0;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap}
.bk-pg{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border-radius:999px;background:#fff;border:1.5px solid var(--ink);font-weight:800;text-decoration:none;font-size:14px}
.bk-pg.is-off{border-color:var(--line);color:#a3a89d}
.bk-pg-at{font:700 13px var(--mono);color:var(--mute)}

/* 404 */
.bk-404-links{max-width:1180px;margin:10px auto 0;padding:0 24px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px}
.bk-404-links .bk-kick{margin:0 6px 0 0}
.bk-404-links a{display:inline-flex;align-items:center;min-height:44px;font-size:14px}

/* 页脚 */
.bk-foot{margin-top:56px;background:#15171c;color:#c9cdd4}
.bk-foot-in{max-width:1180px;margin:0 auto;padding:34px 24px 26px;display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:20px 48px}
.bk-foot .bk-logo{color:#fff}
.bk-foot-id p{margin:10px 0 0;font-size:13.5px;line-height:1.8}
.bk-foot-id a{color:#fff}
.bk-foot-risk{color:#9aa0aa}
.bk-foot-links{display:flex;flex-wrap:wrap;align-content:flex-start;gap:0 18px}
.bk-foot-links a{display:inline-flex;align-items:center;min-height:44px;font-size:14px;color:#e6e8ec;text-decoration:none}
.bk-foot-links a:hover{text-decoration:underline}
.bk-foot-c{grid-column:1/-1;margin:0;padding-top:16px;border-top:1px solid #2b2f38;font-size:12.5px;color:#8a909a}
.bk-foot-c a{display:inline-flex;align-items:center;min-height:44px;color:#c9cdd4}

/* 竖主干（栏目页 / 标签页第 7 片起）：两列，每列一根主干，叶子从主干弯进来；最后一片只画到中线 */
.bk-trunk{max-width:1180px;margin:0 auto 18px;padding:0 24px}
.bk-trunk-top{position:relative;margin:0 0 14px;padding-top:30px;text-align:center}
.bk-trunk-top::before{content:"";position:absolute;left:50%;top:0;height:26px;border-left:3px dashed #a0a69b}
.bk-trunk-top span{display:inline-block;font:800 12px/1 var(--mono);letter-spacing:.08em;padding:7px 12px;border-radius:999px;background:#fff;border:1.5px dashed #8d9388}
.bk-trunk-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}
.bk-tcol{list-style:none;margin:0;padding:0 0 0 30px}
.bk-tcol .bk-node{margin:0 0 12px}
.bk-tcol .bk-node:last-child{margin-bottom:0}
.bk-tcol .bk-nd{flex:1 1 auto;padding:9px 40px 10px 13px;border-left:6px solid var(--c)}
.bk-tcol .bk-nd-no{position:absolute;right:12px;top:11px}
.bk-tcol .bk-nd-t{font-size:15.5px;font-weight:800}
.bk-tcol .bk-twig{position:absolute;left:-22px;top:-12px;width:22px;height:calc(100% + 12px);border-left:var(--tw) solid var(--trunk)}
.bk-tcol .bk-twig::after{content:"";position:absolute;left:calc(-1 * var(--tw));top:0;width:calc(100% + var(--tw));height:calc(12px + (100% - 12px) / 2);border-left:var(--tw) solid var(--trunk);border-bottom:var(--tw) solid var(--c);border-radius:0 0 0 14px}
.bk-tcol .bk-node:first-child .bk-twig{top:0;height:100%}
.bk-tcol .bk-node:first-child .bk-twig::after{height:50%}
.bk-tcol .bk-node:last-child .bk-twig{border-left-color:transparent}

/* ───── 平板 ───── */
@media (max-width:1060px){
 :root{--reach:44px}
 .bk-map{grid-template-columns:minmax(0,1fr) minmax(230px,250px) minmax(0,1fr)}
 .bk-root{padding:16px 15px 14px}
 .bk-root-t b{font-size:30px}
 .bk-kit code{font-size:25px}
 .bk-nd-g{display:none}
 .bk-nd-t{font-size:16.5px}
 .bk-card{grid-template-columns:200px minmax(0,1fr)}
 .bk-flesh{padding:22px 24px 24px}
 .bk-side-row.is-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
 :root{--reach:34px;--gap:16px}
 .bk-map{grid-template-columns:minmax(0,1fr) 220px minmax(0,1fr);padding-left:18px;padding-right:18px}
 .bk-nd{padding:10px 12px 11px}
 .bk-nd-s{font-size:12.5px}
 .bk-nd-lv i{font-size:11.5px;padding:1px 7px}
 .bk-kit code{font-size:22px;letter-spacing:.08em}
 .bk-copy{padding:0 11px}
 .bk-qas{grid-template-columns:1fr}
 .bk-uid-row{grid-template-columns:1fr}
 .bk-uid-page{margin-right:150px}
}

/* ───── 手机：竖主干在左，根在顶上，枝依次挂下来 ───── */
@media (max-width:700px){
 :root{--gap:12px;--tw:3px}
 .bk-top-in{padding:6px 16px}
 .bk-top-in{gap:8px}
 .bk-nav{justify-content:flex-start;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent);mask-image:linear-gradient(90deg,#000 85%,transparent);padding-right:14px}
 .bk-nav::-webkit-scrollbar{display:none}
 .bk-nav a{flex:none;padding:0 9px;font-size:13.5px}
 .bk-logo{flex:none}
 .bk-crumbs{padding:12px 16px 0}
 .bk-hero{padding:14px 16px 2px}
 .bk-hero h1{font-size:21px;line-height:1.35}
 .bk-dek,.bk-legend{display:none}
 .bk-intro{font-size:14px}
 .bk-map{display:block;margin-top:12px;padding:0 16px 8px}
 .bk-root{margin:0 0 var(--gap);padding:12px 14px;border-radius:18px;box-shadow:0 18px 30px -22px rgba(17,19,23,.7),0 0 0 3px var(--paper),0 0 0 5px var(--c)}
 .bk-root-k{margin:0 0 6px;font-size:10px;padding:4px 8px 4px 10px}
 .bk-root-t b{font-size:26px}
 .bk-is-art .bk-root-t b,.bk-is-list .bk-root-t b,.bk-is-plain .bk-root-t b,.bk-is-404 .bk-root-t b{font-size:17px}
 .bk-root-s{margin-top:4px;font-size:12.5px}
 .bk-root-go{margin-top:0}
 .bk-col{display:block;padding-left:30px;margin:0 0 var(--gap)}
 .bk-col:last-of-type{margin-bottom:0}
 .bk-node{margin:0 0 var(--gap)}
 .bk-node:last-child{margin-bottom:0}
 .bk-col.is-l .bk-node{justify-content:flex-start}
 .bk-nd,.is-compact .bk-nd{flex:1 1 auto;padding:9px 12px 10px;border-radius:12px}
 .bk-col.is-l .bk-nd,.bk-col.is-r .bk-nd{border-right:1px solid var(--line);border-left:6px solid var(--c)}
 .bk-nd-t{font-size:16px}
 .bk-nd-s{display:none}
 .bk-nd-lv{margin-top:3px}
 .bk-nd-g{display:none}
 .bk-nd-no{position:absolute;right:10px;top:10px}
 .bk-nd,.is-compact .bk-nd{padding-right:36px}
 /* 竖主干：每片叶子从「上一片底下」画到自己中线，再弯进卡片；最后一片只画到中线 */
 .bk-twig,.bk-col.is-l .bk-twig,.bk-col.is-r .bk-twig,.bk-twig.is-dn,.bk-twig.is-up,.bk-twig.is-flat{left:-22px;right:auto;top:calc(-1 * var(--gap));bottom:auto;width:22px;height:calc(100% + var(--gap));margin:0;border:0;border-left:var(--tw) solid var(--trunk)}
 .bk-twig::before{display:none}
 .bk-twig::after,.bk-col.is-l .bk-twig.is-dn::after,.bk-col.is-l .bk-twig.is-up::after,.bk-col.is-r .bk-twig.is-dn::after,.bk-col.is-r .bk-twig.is-up::after{content:"";display:block;position:absolute;left:calc(-1 * var(--tw));right:auto;top:0;bottom:auto;width:calc(100% + var(--tw));height:calc(var(--gap) + (100% - var(--gap)) / 2);border:0;border-left:var(--tw) solid var(--trunk);border-bottom:var(--tw) solid var(--c);border-radius:0 0 0 14px}
 .bk-col:last-of-type .bk-node:last-child .bk-twig{border-left-color:transparent}
 .bk-map.is-broken .bk-twig{border-left-style:dashed}
 /* 码卡缩成底部固定条（码 + 复制 + 按钮 + 一行披露），首屏留给导图 */
 .has-kit{padding-bottom:104px}
 .bk-kit{position:fixed;left:0;right:0;bottom:0;z-index:60;margin:0;padding:8px 12px calc(8px + env(safe-area-inset-bottom));border:0;border-radius:18px 18px 0 0;background:#15171c;display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"row go" "mini mini";gap:5px 10px;align-items:center;box-shadow:0 -16px 34px -14px rgba(0,0,0,.55)}
 .bk-kit-k,.bk-kit-gain,.bk-kit-note,.bk-kit-star{display:none}
 .bk-kit-row{grid-area:row;gap:6px}
 .bk-kit code{font-size:19px;letter-spacing:.08em}
 .bk-copy{padding:0 11px;font-size:12.5px}
 .bk-go{grid-area:go;margin:0;min-height:44px;font-size:14px;border-radius:12px}
 .bk-kit-mini{grid-area:mini;display:block;margin:0;font-size:11px;line-height:1.4;color:#bfc3cb;text-align:center}
 .bk-kit.is-bare{grid-template-areas:"row row" "mini mini"}
 .bk-kit.is-bare .bk-kit-row{justify-content:center}
 .bk-trunk{padding:0 16px}
 .bk-trunk-cols{grid-template-columns:1fr}
 .bk-trunk-cols .bk-tcol+.bk-tcol{margin-top:12px}
 .bk-trunk-top{display:none}
 /* 手机上导图和竖主干接成一根：导图最后一片不收尾，主干第一片从上面接下来 */
 .bk-map:has(+ .bk-trunk){padding-bottom:12px}
 .bk-map:has(+ .bk-trunk) .bk-col:last-of-type .bk-node:last-child .bk-twig{border-left-color:var(--trunk)}
 .bk-tcol .bk-node:first-child .bk-twig{top:-12px;height:calc(100% + 12px)}
 .bk-tcol .bk-node:first-child .bk-twig::after{height:calc(12px + (100% - 12px) / 2)}
 .bk-tcol:first-child:not(:last-child) .bk-node:last-child .bk-twig{border-left-color:var(--trunk)}
 /* 枝卡：茎变成顶上一条 */
 .bk-cards{margin-top:22px;padding:0 16px;gap:14px}
 .bk-card{grid-template-columns:1fr;border-radius:18px}
 .bk-stem{padding:14px 14px 12px;border-right:0;border-bottom:1px solid var(--line)}
 .bk-stem-in{position:static;display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
 .bk-stem-k{flex-direction:row;align-items:center;gap:8px}
 .bk-stem-k b{font-size:20px}
 .bk-twigs{display:none}
 .bk-gate{margin:0;flex:1 1 100%;font-size:12.5px;padding:7px 10px}
 .bk-up{margin:0 0 0 auto}
 .bk-flesh{padding:16px 16px 18px}
 .bk-flesh>.bk-h{font-size:19px}
 .bk-body{font-size:15.5px;line-height:1.8}
 .bk-body h3,.bk-body .bk-h3{font-size:16.5px}
 .bk-state{grid-template-columns:1fr;gap:16px}
 .bk-state::before{left:28px;top:auto;bottom:calc(50% - 8px);width:3px;height:16px;display:none}
 .bk-pair{grid-template-columns:1fr}
 .bk-uid-page{margin:14px 118px 0 10px;padding:8px}
 .bk-uid-page .bk-uid-face{display:none}
 .bk-uid-page .bk-uid-line{gap:5px;padding:4px 7px}
 .bk-uid-page .bk-uid-line code{font-size:10px;letter-spacing:0}
 .bk-uid-web>div{min-height:226px}
 .bk-uid-drop{width:106px;right:8px;top:80px}
 .bk-uid-drop li{padding:5px 7px;font-size:12px}
 .bk-out,.bk-side,.bk-tags,.bk-author,.bk-404-links,.bk-pager{padding-left:16px;padding-right:16px}
 .bk-out-top{padding-left:44px}
 .bk-out-top::before{left:12px}
 .bk-qa{padding:14px 14px 14px 52px}
 .bk-qn{left:12px;top:14px}
 .bk-side-row,.bk-side-row.is-4{grid-template-columns:1fr;padding:0 0 0 30px;gap:12px}
 .bk-side-row::before{left:8px;right:auto;top:0;bottom:24px;width:3px;height:auto}
 .bk-sleaf::before{left:-22px;top:50%;width:22px;height:3px}
 .bk-cover{padding:0 16px}
 .bk-foot-in{grid-template-columns:1fr;padding:28px 16px 22px}
 .bk-tbl[data-cols="3"],.bk-tbl[data-cols="4"],.bk-tbl[data-cols="5"],.bk-tbl[data-cols="6"]{border:0;background:none;overflow:visible}
 .bk-tbl[data-cols="3"] thead,.bk-tbl[data-cols="4"] thead,.bk-tbl[data-cols="5"] thead,.bk-tbl[data-cols="6"] thead{display:none}
 .bk-tbl[data-cols="3"] tr,.bk-tbl[data-cols="4"] tr,.bk-tbl[data-cols="5"] tr,.bk-tbl[data-cols="6"] tr{display:block;margin:0 0 10px;padding:8px 12px;background:#fff;border:1px solid var(--line);border-left:5px solid var(--c,var(--ink));border-radius:12px}
 .bk-tbl[data-cols="3"] td,.bk-tbl[data-cols="4"] td,.bk-tbl[data-cols="5"] td,.bk-tbl[data-cols="6"] td{display:block;border:0;padding:4px 0}
 .bk-tbl[data-cols="3"] td::before,.bk-tbl[data-cols="4"] td::before,.bk-tbl[data-cols="5"] td::before,.bk-tbl[data-cols="6"] td::before{content:attr(data-th);display:block;font-size:11.5px;font-weight:800;color:var(--c-ink,var(--mute))}
}
@media (max-width:380px){
 .bk-nav a{padding:0 7px;font-size:13px}
 .bk-logo span{letter-spacing:.14em}
 .bk-kit code{font-size:17px;letter-spacing:.05em}
 .bk-go{font-size:13px;padding:0 8px}
 .bk-go::after{margin-left:4px}
}
@media print{.bk-kit,.bk-twig,.bk-top,.bk-foot{display:none}.bk-map{display:block}body{background:#fff}}