:root{--paper:#FAFAF8;--paper-sunk:#F2F2EF;--rule:#E4E6EC;--rule-firm:#C9CCD8;--ink:#3E3A6E;--ink-soft:#6F6B94;--ink-faint:#6E6A92;--seal:#B0362E;--jade:#3F7966;--ochre:#906622;--brick:#A34A3C;--jade-wash:#EDF3F0;--ochre-wash:#F8F2E5;--brick-wash:#F7EDEB;--font-sans:"Be Vietnam Pro",system-ui,"Segoe UI",Roboto,sans-serif,"Noto Sans SC";--font-display:"Bricolage Grotesque","Be Vietnam Pro",sans-serif;--font-cn:"Noto Serif SC",serif;--font-mono:ui-monospace,"Cascadia Mono","SF Mono",Menlo,Consolas,"DejaVu Sans Mono","Be Vietnam Pro",monospace;--t-caption:clamp(13px,0.78rem + 0.12vw,15px);--t-small:clamp(15px,0.90rem + 0.20vw,18px);--t-body:clamp(17px,1.00rem + 0.28vw,21px);--t-lead:clamp(20px,1.15rem + 0.45vw,26px);--t-h3:clamp(23px,1.30rem + 0.70vw,32px);--t-h2:clamp(28px,1.55rem + 1.10vw,42px);--t-h1:clamp(34px,1.85rem + 1.90vw,58px);--t-hanzi:clamp(64px,3.40rem + 3.00vw,104px);--lh-tight:1.25;--lh-body:1.65;--lh-loose:1.8;--s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:48px;--s8:64px;--s-block:clamp(48px,3vw + 32px,88px);--radius:10px;--radius-lg:16px;--line:1px solid var(--rule);--line-firm:1px solid var(--rule-firm);--dur:160ms;--ease:cubic-bezier(0.2,0,0,1)}*,:after,:before{box-sizing:border-box}body,html{margin:0;padding:0;font-family:var(--font-sans);font-size:var(--t-body);line-height:var(--lh-body);-webkit-font-smoothing:antialiased}a,body,html{color:var(--ink)}a{-webkit-text-decoration-color:var(--rule-firm);text-decoration-color:var(--rule-firm);text-underline-offset:3px}a:hover{color:var(--ink-soft)}.hanzi{font-family:var(--font-cn);font-size:.94em;font-feature-settings:"liga" 0}.paper-grid{background-color:var(--paper);background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);background-size:28px 28px;background-position:-1px -1px}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.01ms!important;transition-duration:.01ms!important}}:focus-visible{outline:2px solid var(--ink);outline-offset:2px}body{background-color:var(--paper-sunk);background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);background-size:28px 28px;background-position:-1px -1px;background-attachment:fixed}.sheet{background:var(--paper);border:var(--line-firm);border-radius:var(--radius-lg);box-shadow:0 1px 2px rgba(62,58,110,.04),0 8px 24px -12px rgba(62,58,110,.1)}.block{margin-top:var(--s-block)}.block:first-of-type{margin-top:var(--s6)}.lvl-1{font-size:var(--t-h1);letter-spacing:-.015em}.lvl-1,.lvl-2{font-family:var(--font-display);font-weight:600;line-height:var(--lh-tight)}.lvl-2{font-size:var(--t-h2);letter-spacing:-.01em}.lvl-3{font-size:var(--t-caption);letter-spacing:.09em;text-transform:uppercase;color:var(--ink-faint);font-weight:500}.hidden-sm{display:inline}@media (max-width:640px){.hidden-sm{display:none!important}}@media print{body{background:#fff!important;margin:0!important;padding:0!important}[role=region],button,footer,header{display:none!important}}.guide{display:flex;gap:var(--s3);align-items:flex-start;padding:var(--s3) var(--s4);background:var(--paper-sunk);border-left:2px solid var(--rule-firm);border-radius:0 var(--radius) var(--radius) 0;font-size:var(--t-small);color:var(--ink-soft);line-height:var(--lh-body)}.guide b{color:var(--ink);font-weight:500}.guide-num{flex:none;width:20px;height:20px;border-radius:50%;background:var(--ink);color:var(--paper);font:600 11px/20px var(--font-mono);text-align:center}.tianzige{position:relative;background:var(--paper);border:1px solid var(--rule-firm);aspect-ratio:1}.tianzige:before{background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);background-size:100% 50%,50% 100%;background-position:0 50%,50% 0;background-repeat:no-repeat}.mizige:after,.tianzige:before{content:"";position:absolute;inset:0;pointer-events:none}.mizige:after{background-image:linear-gradient(to bottom right,transparent calc(50% - .5px),var(--rule) calc(50% - .5px),var(--rule) calc(50% + .5px),transparent calc(50% + .5px)),linear-gradient(to bottom left,transparent calc(50% - .5px),var(--rule) calc(50% - .5px),var(--rule) calc(50% + .5px),transparent calc(50% + .5px))}@keyframes ink-draw{0%{stroke-dashoffset:100;opacity:.35}55%{stroke-dashoffset:0;opacity:1}to{stroke-dashoffset:-100;opacity:.35}}.ink-loading path{stroke-dasharray:100;animation:ink-draw 1.4s var(--ease) infinite}@keyframes vc-pop{0%{transform:scale(1)}45%{transform:scale(1.04)}to{transform:scale(1)}}@keyframes vc-shake{0%,to{transform:translateX(0)}20%,60%{transform:translateX(-4px)}40%,80%{transform:translateX(4px)}}.fb-dung{animation:vc-pop .2s var(--ease);border-color:var(--jade)!important;background-color:var(--jade-wash)!important}.fb-sai{animation:vc-shake .26s var(--ease);border-color:var(--brick)!important;background-color:var(--brick-wash)!important}@media print{@page{size:A4 portrait;margin:8mm 10mm}body,html{background:#ffffff!important;padding:0!important;margin:0!important;width:100%!important;-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important}.no-print,[class*=controlPanel],[class*=controlsCard],[class*=mobileBottomNav],button,footer,header,nav{display:none!important}}