:root{--ink:#e8edf3;--paper:#101f35;--panel:#162941;--orange:#f2994a;--orange-soft:#f6ad6b;--line:#32435a;--muted:#b4c1d2;--gutter:clamp(20px,5vw,120px)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:1rem/1.75 ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}.wrap{width:min(1120px,calc(100% - var(--gutter)*2));margin:auto}header{border-bottom:1px solid var(--line);background:#0d1b30}nav{min-height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:15px;text-decoration:none;font-size:1.5rem;font-weight:550;letter-spacing:-.04em;line-height:1.15}.connection-mark{width:44px;height:44px;display:block}.brand-wordmark{display:flex;flex-direction:column;gap:7px}.brand-wordmark small{font-size:.625rem;letter-spacing:.32em;text-transform:uppercase;color:#9badc3;font-weight:500}.nav-actions{display:flex;align-items:center;gap:20px}.back{color:var(--muted);text-decoration:none;font-size:.9rem}.back:hover{color:var(--orange-soft)}.lang{font:600 .875rem/1.5 inherit;border:1px solid #52617a;border-radius:2px;background:transparent;color:var(--ink);padding:8px 14px;cursor:pointer}
.hero{padding:72px 0 54px;border-bottom:1px solid var(--line);background:radial-gradient(ellipse at 85% 10%,#233b58 0,transparent 58%),#101f35}.eyebrow{font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;color:var(--orange-soft);display:flex;align-items:center;gap:14px;font-weight:600}.eyebrow:before{content:'';width:34px;height:2px;background:var(--orange)}h1{font:400 clamp(2.7rem,5vw,4.8rem)/1.08 Georgia,'Times New Roman',serif;letter-spacing:-.035em;margin:22px 0 18px}.intro{max-width:720px;color:var(--muted);font-size:1.05rem}.updated{margin-top:22px;color:#91a4bb;font-size:.875rem}
.content{padding:62px 0 90px}.language-panel{display:none}.language-panel.active{display:block}.toc{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:42px}.toc a{border:1px solid #43566f;background:#13243c;padding:8px 12px;color:#c8d4e3;text-decoration:none;font-size:.875rem}.toc a:hover{border-color:var(--orange);color:var(--orange-soft)}article{display:grid;grid-template-columns:minmax(180px,.42fr) minmax(0,1fr);gap:28px 72px;padding:34px 0;border-top:1px solid var(--line);scroll-margin-top:24px}article h2{font:400 clamp(1.45rem,2vw,2rem)/1.35 Georgia,'Times New Roman',serif;margin:0;color:#f2f5f9}article .copy{max-width:760px}p{margin:0 0 16px;color:#c7d2df}p:last-child{margin-bottom:0}ul{margin:0 0 16px;padding-left:21px;color:#c7d2df}li{margin:8px 0}li::marker{color:var(--orange)}strong{color:#f2f5f9;font-weight:600}.identity{border-left:3px solid var(--orange);padding:20px 24px;background:#152841}.identity p{margin:5px 0}.email{color:var(--orange-soft);text-underline-offset:4px}.note{border:1px solid #43566f;background:#13243c;padding:20px 22px;color:#b8c6d7}
footer{padding:28px 0;background:#0b1728;border-top:1px solid var(--line);color:#aebed2;font-size:.875rem}.footer-grid{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}.footer-links{display:flex;gap:18px}.footer-links a{text-underline-offset:5px}.footer-links a[aria-current='page']{color:var(--orange-soft)}a:focus-visible,button:focus-visible{outline:3px solid var(--orange-soft);outline-offset:5px}::selection{background:var(--orange);color:#101f35}html[lang='zh-CN'] h1,html[lang='zh-CN'] article h2{font-family:inherit;letter-spacing:0}
@media(max-width:720px){.wrap{width:calc(100% - 40px)}nav{min-height:76px}.brand{font-size:1.25rem}.connection-mark{width:38px;height:38px}.back{display:none}.hero{padding:46px 0 38px}h1{font-size:2.6rem}.content{padding:42px 0 65px}article{grid-template-columns:1fr;gap:14px;padding:28px 0}.toc{margin-bottom:26px}.footer-grid{align-items:flex-start;flex-direction:column}}