:root{color-scheme:light dark;--font-heading:var(--font-heading-latin),var(--font-heading-sc,"Noto Sans CJK SC"),"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;--font-body:var(--font-body-latin),var(--font-body-sc,"Noto Sans CJK SC"),"PingFang SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;--font-quote:var(--font-quote-sc,Georgia),Georgia,"Songti SC",serif;--font-mono:ui-monospace,"SFMono-Regular",Menlo,monospace;--grey-50:#fbfcfd;--grey-100:#f4f6f8;--grey-200:#e5e7eb;--grey-300:#d3d8e0;--grey-400:#9aa4b2;--grey-500:#6b7280;--grey-600:#4b5563;--grey-700:#303a48;--grey-800:#111827;--grey-900:#0b1119;--paper:#ffffff;--paper-2:var(--grey-200);--ink:var(--grey-800);--ink-2:var(--grey-600);--ink-3:var(--grey-500);--rule:var(--grey-300);--rule-2:var(--grey-400);--deep:#0b1d33;--deep-2:#12293f;--deep-ink:#ffffff;--deep-ink-2:#9aa4b2;--deep-rule:rgb(154 164 178/24%);--brand-lighter:#d7f4f7;--brand-light:#4fc6d3;--brand:#00a3b5;--brand-dark:#007e8c;--brand-darker:#005a65;--on-brand:#ffffff;--brand-ink:#00707c;--accent-mint:#20d6c2;--accent-blue:#0077ff;--ok:#0f7a4d;--ok-wash:#d8f5e6;--hold:#9a6400;--hold-wash:#fdf1cf;--off:var(--grey-500);--off-wash:var(--grey-100);--air:#a32019;--air-wash:#fde4e1;--track-on:var(--brand);--track-off:var(--grey-300);--track-on-deep:var(--accent-mint);--track-off-deep:rgb(154 164 178/30%);--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--h6:clamp(1.0625rem,1rem + 0.2vw,1.125rem);--h5:clamp(1.125rem,1.05rem + 0.3vw,1.25rem);--h4:clamp(1.25rem,1.1rem + 0.6vw,1.5rem);--h3:clamp(1.5rem,1.2rem + 1.3vw,2rem);--h2:clamp(2rem,1.4rem + 2.6vw,3rem);--h1:clamp(2.5rem,1.6rem + 3.9vw,4rem);--lh-tight:1.25;--lh-snug:1.33;--lh-body:1.5;--s1:0.25rem;--s2:0.5rem;--s3:0.75rem;--s4:1rem;--s5:1.25rem;--s6:1.5rem;--s8:2rem;--s10:2.5rem;--s12:3rem;--s16:4rem;--s20:5rem;--s24:6rem;--s32:8rem;--radius-xs:4px;--radius:8px;--radius-lg:16px;--radius-xl:24px;--radius-pill:999px;--shadow-1:0 2px 1px -1px rgb(107 114 128/20%),0 1px 1px rgb(107 114 128/14%),0 1px 3px rgb(107 114 128/12%);--shadow-4:0 2px 4px -1px rgb(107 114 128/20%),0 4px 5px rgb(107 114 128/14%),0 1px 10px rgb(107 114 128/12%);--shadow-8:0 5px 5px -3px rgb(107 114 128/20%),0 8px 10px 1px rgb(107 114 128/14%),0 3px 14px 2px rgb(107 114 128/12%);--shadow-16:0 8px 10px -5px rgb(107 114 128/20%),0 16px 24px 2px rgb(107 114 128/14%),0 6px 30px 5px rgb(107 114 128/12%);--shadow-brand:0 8px 16px rgb(0 163 181/26%);--measure:66ch;--shell:1200px;--header-h:4.5rem;--gutter:clamp(1rem,4vw,2.5rem);--ease:cubic-bezier(0.4,0,0.2,1);--t-fast:200ms;--t-med:320ms}:lang(zh){--measure:40em;--lh-body:1.75;--lh-tight:1.35;--h1:clamp(2rem,1.5rem + 2.4vw,3.25rem);--h2:clamp(1.7rem,1.35rem + 1.7vw,2.5rem);--h3:clamp(1.35rem,1.15rem + 0.9vw,1.75rem)}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--paper:var(--grey-900);--paper-2:#1a222b;--ink:#ffffff;--ink-2:var(--grey-400);--ink-3:#7e8899;--rule:rgb(154 164 178/20%);--rule-2:rgb(154 164 178/32%);--deep:#071322;--deep-2:#0b1d33;--brand:#23c4d6;--brand-ink:#4fc6d3;--brand-dark:#00a3b5;--track-on:var(--accent-mint);--track-off:rgb(154 164 178/26%);--ok:#5fd6a0;--ok-wash:#0d2a1e;--hold:#ffd166;--hold-wash:#2f260c;--off:var(--grey-400);--off-wash:#18202b;--air:#ff9c93;--air-wash:#331512;--shadow-1:0 2px 1px -1px rgb(0 0 0/40%),0 1px 3px rgb(0 0 0/30%);--shadow-4:0 2px 4px -1px rgb(0 0 0/45%),0 4px 10px rgb(0 0 0/35%);--shadow-8:0 5px 5px -3px rgb(0 0 0/50%),0 8px 14px rgb(0 0 0/40%);--shadow-16:0 8px 10px -5px rgb(0 0 0/55%),0 16px 30px rgb(0 0 0/45%)}}*,:after,:before{box-sizing:border-box}html{-webkit-text-size-adjust:100%;overflow-x:clip;scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:var(--text-base);line-height:var(--lh-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3,h4{margin:0;font-family:var(--font-heading);line-height:var(--lh-tight);text-wrap:balance}h1,h2{font-weight:800;letter-spacing:-.01em}h3,h4{font-weight:700;line-height:var(--lh-snug)}:lang(zh) h1,:lang(zh) h2{font-weight:900;letter-spacing:0}:lang(zh) h3,:lang(zh) h4{letter-spacing:0}h1{font-size:var(--h1)}h2{font-size:var(--h2)}h3{font-size:var(--h3)}h4{font-size:var(--h4)}p{margin:0}a{color:inherit}img,video{max-width:100%;display:block}:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:var(--radius-xs)}::selection{background:var(--brand-lighter);color:var(--grey-800)}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.u-label{font-family:var(--font-body);font-size:var(--text-xs);font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}.u-mono{font-family:var(--font-mono);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;letter-spacing:.01em}.u-visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}main>[data-card-block]:last-child{margin-block-end:var(--s16)}main>[data-hero-overlay]:first-child{margin-block-start:calc(var(--header-h) * -1)}@media (max-width:68rem){:root{--header-h:7rem}}main>[data-ground=sunk]+[data-card-block]{--card-ground:var(--paper)}main>[data-ground=sunk]+[data-ground=sunk]{--band-ground:var(--paper)}