:root{color-scheme:light;--ink:oklch(25% .045 255);--ink-deep:oklch(18% .035 255);--paper:oklch(98% .008 88);--canvas:oklch(94% .012 88);--red:oklch(50% .17 28);--red-dark:oklch(42% .15 28);--gold:oklch(67% .09 75);--muted:oklch(49% .025 255);--line:oklch(82% .018 255);--nav-bg:oklch(92% .025 245);--nav-border:oklch(78% .04 245);--portal-frame:oklch(68% .09 245);--heading-accent:oklch(43% .105 250);--link-accent:oklch(59% .1 245);--section-band:oklch(96% .01 245);--topic-accent:oklch(64% .13 250);--resource-bg:oklch(90% .035 245);--resource-border:oklch(80% .04 245);--resource-ink:oklch(36% .09 250);--footer-bg:oklch(22% .025 245);--footer-muted:oklch(82% .012 245);--serif:"Songti SC","STSong","SimSun",serif;--sans:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;--max:1240px}[data-theme=ledger]{--ink:oklch(27% .052 163);--ink-deep:oklch(19% .038 163);--paper:oklch(98% .009 92);--canvas:oklch(94% .014 96);--red:oklch(54% .12 58);--red-dark:oklch(45% .1 58);--gold:oklch(65% .1 72);--muted:oklch(49% .027 163);--line:oklch(81% .022 158);--nav-bg:oklch(92% .027 158);--nav-border:oklch(76% .042 158);--portal-frame:oklch(62% .075 160);--heading-accent:oklch(39% .08 163);--link-accent:oklch(52% .09 163);--section-band:oklch(95% .018 150);--topic-accent:oklch(50% .09 163);--resource-bg:oklch(90% .038 153);--resource-border:oklch(78% .045 158);--resource-ink:oklch(34% .07 163);--footer-bg:oklch(21% .035 163);--footer-muted:oklch(82% .018 153)}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:clip}body{margin:0;background:var(--canvas);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:none}button,input{font:inherit}a,button{touch-action:manipulation}h1,h2,h3,p{margin-top:0}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--red);outline-offset:3px}.backToTop{width:46px;height:46px;position:fixed;z-index:45;right:18px;bottom:max(18px,env(safe-area-inset-bottom));display:grid;place-items:center;padding:0;border:0;border-radius:50%;background:var(--red);color:var(--paper);box-shadow:0 8px 24px color-mix(in oklch,var(--ink-deep) 25%,transparent);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .16s ease,transform .16s ease,visibility .16s ease,background-color .22s ease,color .22s ease,box-shadow .22s ease;cursor:pointer}.backToTop,body{transition:background-color .22s ease,color .22s ease,border-color .22s ease,box-shadow .22s ease}.backToTop.visible{opacity:1;visibility:visible;transform:translateY(0)}.backToTop span{width:13px;height:13px;border-top:2px solid;border-left:2px solid;transform:translateY(3px) rotate(45deg)}@media(hover:hover){.backToTop:hover{background:var(--red-dark)}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}:root{--fixed-footer-bg:oklch(22% .025 245);--fixed-footer-muted:oklch(82% .012 245);--back-to-top-bg:#19334f;--back-to-top-hover:#10263d}[data-theme=ledger]{--back-to-top-bg:#285849;--back-to-top-hover:#1d4538}.backToTop{background:var(--back-to-top-bg)}@media(hover:hover){.backToTop:hover{background:var(--back-to-top-hover)}}