/* Hallmark · component: shared navigation controller · genre: modern-minimal · theme: PanFlow light */
html{scrollbar-gutter:stable}
.site-skip-link{position:fixed;top:10px;left:10px;z-index:999;width:max-content;max-width:calc(100vw - 20px);padding:10px 14px;border-radius:8px;background:var(--color-ink,#171925);color:var(--color-paper,#fff);font:600 14px/1.2 var(--font-body,Inter,"PingFang SC","Microsoft YaHei",sans-serif);text-decoration:none;transform:translateY(-150%);transition:transform .16s ease-out}.site-skip-link:focus{transform:translateY(0);outline:3px solid var(--color-focus,#94adff);outline-offset:2px}@media(prefers-reduced-motion:reduce){.site-skip-link{transition:none}}
.top-nav-app .site-header{box-sizing:border-box;position:sticky;top:0;z-index:60;display:flex;align-items:center;gap:24px;width:100%;min-height:72px;padding-block:0;padding-inline:max(clamp(20px,4vw,72px),env(safe-area-inset-left));border-bottom:1px solid var(--color-line,#e8ebf2);background:var(--color-paper,#fff);font-family:var(--font-body,Inter,"PingFang SC","Microsoft YaHei",sans-serif)}
.top-nav-app .site-brand{display:flex;align-items:center;gap:10px;color:var(--color-ink,#171925);font-size:18px;font-weight:700;text-decoration:none;white-space:nowrap}.top-nav-app .site-brand-seal{display:grid;width:38px;height:38px;place-items:center;border-radius:10px;background:var(--color-brand,#526df6);color:#fff;font:22px "KaiTi",serif}.top-nav-app .site-nav{display:flex;align-items:center;justify-content:center;gap:6px;min-width:0;margin:auto}.top-nav-app .site-nav-link{display:flex;align-items:center;justify-content:center;min-height:44px;padding:0 15px;border-radius:10px;color:var(--color-body,#4d5567);font-size:14px;font-weight:500;text-decoration:none;white-space:nowrap}.top-nav-app .site-nav-link:hover{background:var(--color-surface,#fafbfe);color:var(--color-brand,#526df6)}
.top-nav-app .site-header>#account-button{height:40px;padding:0 15px;border:0;border-radius:9px;background:var(--color-brand,#526df6);color:#fff;font:600 14px var(--font-body,Inter,"PingFang SC","Microsoft YaHei",sans-serif);white-space:nowrap}
.top-nav-app .site-header{overflow:visible}
.top-nav-app .site-nav{scroll-behavior:smooth;overscroll-behavior-inline:contain}
.top-nav-app .site-nav.has-overflow-end{-webkit-mask-image:linear-gradient(90deg,var(--color-ink) 0,var(--color-ink) calc(100% - 34px),transparent 100%);mask-image:linear-gradient(90deg,var(--color-ink) 0,var(--color-ink) calc(100% - 34px),transparent 100%)}
.top-nav-app .site-nav.has-overflow-start:not(.has-overflow-end){-webkit-mask-image:linear-gradient(90deg,transparent 0,var(--color-ink) 34px,var(--color-ink) 100%);mask-image:linear-gradient(90deg,transparent 0,var(--color-ink) 34px,var(--color-ink) 100%)}
.top-nav-app .site-nav.has-overflow-start.has-overflow-end{-webkit-mask-image:linear-gradient(90deg,transparent 0,var(--color-ink) 34px,var(--color-ink) calc(100% - 34px),transparent 100%);mask-image:linear-gradient(90deg,transparent 0,var(--color-ink) 34px,var(--color-ink) calc(100% - 34px),transparent 100%)}
.site-nav-scroll-hint{display:none}
.site-nav-toggle{display:none;min-width:44px;min-height:44px;padding:0 12px;border:1px solid var(--color-line-strong);border-radius:9px;background:var(--color-paper);color:var(--color-ink);font:600 14px var(--font-body);cursor:pointer}
.top-nav-app .site-nav-link[aria-current="page"]{background:var(--nav-accent-soft,var(--color-brand-soft));color:var(--brand,var(--color-brand));font-weight:500}
@media(max-width:900px){.top-nav-app .site-header{align-items:center}.top-nav-app .site-nav{min-width:0;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch}.top-nav-app .site-nav::-webkit-scrollbar{display:none}.top-nav-app .site-nav-link{flex:0 0 auto;white-space:nowrap}.top-nav-app .site-account-actions{flex:0 0 auto}}
@media(max-width:600px){.top-nav-app .site-header{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;gap:8px;padding:8px 10px}.top-nav-app .site-brand{min-height:44px}.top-nav-app .site-brand-name{display:none}.top-nav-app .site-brand-seal{width:36px;height:36px;font-size:20px}.site-nav-toggle{display:inline-flex;grid-column:3;align-items:center;justify-content:center}.top-nav-app .site-header>.site-account-actions{position:static;grid-column:4;height:44px;margin:0}.top-nav-app .site-header>#account-button,.top-nav-app .site-account-actions button{min-height:44px}.top-nav-app .site-nav{display:none;grid-column:1/-1;grid-row:2;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;width:100%;padding-top:8px;border-top:1px solid var(--color-line);overflow:visible;mask-image:none!important;-webkit-mask-image:none!important}.top-nav-app .site-header.nav-open .site-nav{display:grid}.top-nav-app .site-nav>.site-nav-link,.top-nav-app .site-nav-menu>.site-nav-link{width:100%;min-height:44px;padding-inline:10px}.top-nav-app .site-nav-menu{width:100%}.question-library-page .workspace-banner{display:none}.site-nav-scroll-hint{display:none!important}}

/* Canonical site navigation: directly shared from the local-tools page. */
.top-nav-app .site-header{width:100%;height:72px;padding:0 clamp(28px,5vw,72px);display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:24px;border-bottom:1px solid var(--line,var(--color-line));background:color-mix(in srgb,var(--panel,var(--color-paper)) 97%,transparent);box-shadow:0 1px 0 rgba(16,24,40,.03);backdrop-filter:blur(12px)}
@media(min-width:1181px){html.shortlink-root .top-nav-app .site-header{padding-right:calc(clamp(28px,5vw,72px) + 15px)}}
.top-nav-app .site-brand{gap:10px;min-height:0;padding:0;border:0;background:transparent;box-shadow:none}
.top-nav-app .site-brand:hover,.top-nav-app .site-brand:active{border:0;background:transparent;box-shadow:none;transform:none}
.top-nav-app .site-brand .site-brand-seal{width:38px;height:38px;border-radius:12px;background:var(--brand,var(--color-brand));box-shadow:none;font-size:21px}
.top-nav-app .site-brand .site-brand-name{font-size:18px;font-weight:700;letter-spacing:-.02em}
.top-nav-app .site-brand{grid-column:1;justify-self:start}.top-nav-app .site-nav{position:static;grid-column:2;justify-self:center;display:flex;align-items:center;justify-content:center;gap:6px;min-width:0;margin:0;transform:none}.top-nav-app .site-header>.site-account-actions,.top-nav-app .site-header>#account-button{grid-column:3;justify-self:end}
.top-nav-app .site-nav-link{min-width:0;min-height:0;padding:6px 14px;border:0;border-radius:6px;background:transparent;color:var(--text,var(--color-body));font-size:13.5px;font-weight:400;line-height:21.2143px;text-align:center;box-shadow:none}
.top-nav-app .site-nav-link .top-nav-icon{display:none}.top-nav-app .site-nav-link.has-menu-icon{gap:6px}
.top-nav-app .site-nav-link:hover{background:var(--surface,var(--color-surface));color:var(--brand,var(--color-brand))}
.top-nav-app .site-nav-link.active,.top-nav-app .site-nav-link[aria-current="page"]{background:rgba(78,105,253,.07);color:#2b4afd;font-weight:400}
.top-nav-app .site-nav-menu{position:relative}
.top-nav-app .site-dropdown{position:absolute;top:calc(100% + 10px);left:50%;z-index:80;display:none;width:190px;padding:8px;transform:translateX(-50%);border:1px solid var(--line,var(--color-line-strong));border-radius:12px;background:var(--panel,var(--color-paper));box-shadow:var(--nav-shadow,0 12px 30px rgba(31,45,72,.15))}
.top-nav-app .site-nav-menu>.site-nav-link[aria-expanded="true"]+.site-dropdown{display:grid;gap:2px}
.top-nav-app .site-dropdown button,.top-nav-app .site-dropdown a{display:flex;align-items:center;width:100%;min-height:42px;padding:7px 10px;border:0;border-radius:8px;background:transparent;color:var(--text,var(--color-body));text-align:left;text-decoration:none;cursor:pointer}
.top-nav-app .site-dropdown button,.top-nav-app .site-dropdown a{font-size:13.5px;font-weight:400;line-height:21.2143px}
.top-nav-app .top-nav-caret{position:relative;display:inline-block;width:10px;height:10px;flex:0 0 10px;margin-left:2px;font-size:0;line-height:0;transform:none!important}
.top-nav-app .top-nav-caret::before{content:"";position:absolute;top:2px;left:2px;width:4px;height:4px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(45deg)}
.top-nav-app .site-header>.site-account-button,.top-nav-app .site-header>.site-account-actions .site-account-button{height:40px;padding:0 19px;border:0;border-radius:7px;background:linear-gradient(135deg,var(--brand,var(--color-brand)),var(--nav-accent,#6f5ee8));box-shadow:0 8px 20px rgba(23,100,255,.2);color:var(--panel,var(--color-paper));font-weight:600}
.top-nav-app .site-header>.site-account-actions .site-account-button.is-user{border:0;background:transparent;box-shadow:none;color:#5d6677;font-weight:500}
.top-nav-app .site-header>.site-account-actions .site-account-button.is-user:hover{background:#f6f7fb;box-shadow:none;color:var(--brand,var(--color-brand))}
@media(max-width:1180px){.top-nav-app .site-header{display:flex;padding-inline:18px}.top-nav-app .site-brand-name{display:none}.top-nav-app .site-nav{position:static;flex:1;justify-content:flex-start;overflow-x:auto;transform:none;scrollbar-width:none}.top-nav-app .site-nav::-webkit-scrollbar{display:none}.top-nav-app .site-nav-link{flex:0 0 auto;min-width:auto;padding-inline:12px}}
@media(max-width:700px){.top-nav-app .site-header{height:auto;min-height:64px;padding:8px 10px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px}.top-nav-app .site-brand .site-brand-seal{width:32px;height:32px;border-radius:9px;font-size:18px}.top-nav-app .site-nav{width:100%;gap:2px}.top-nav-app .site-nav-link{min-height:44px;padding-inline:10px;font-size:13px}}