:root{--paper:#f7f5f0;--surface:#fffdf9;--ink:#1b1f21;--ink-2:#3b4245;--muted:#6a7174;--rule:#d9d4c9;--rule-2:#e9e5dc;--accent:#9a3412;--accent-2:#0f4c5c;--tint:#f0ebe1;--tint-2:#eef3f3;--warn:#fbf1e3;--serif:"Source Serif 4", Georgia, "Times New Roman", serif;--sans:"IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;--mono:"IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--max:1160px;--read:700px;color-scheme:light}@media (prefers-color-scheme:dark){:root{--paper:#14181a;--surface:#1a1f22;--ink:#e8e6e1;--ink-2:#c9c7c1;--muted:#979c9e;--rule:#343b3e;--rule-2:#2a3033;--accent:#f08a5d;--accent-2:#7cc0cc;--tint:#20262a;--tint-2:#1d2629;--warn:#2a231b;color-scheme:dark}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--paper);color:var(--ink);font:16.5px/1.65 var(--sans);font-feature-settings:"kern";margin:0}a{color:var(--accent-2);text-underline-offset:3px;text-decoration-thickness:1px}a:hover{color:var(--accent)}.wrap{max-width:var(--max);margin:0 auto;padding-left:20px;padding-right:20px}@media (width<=600px){.wrap{padding-left:16px;padding-right:16px}}.skip{position:absolute;left:-999px}.skip:focus{background:var(--surface);z-index:9;padding:6px 10px;top:8px;left:8px}.small{color:var(--muted);font-size:13.5px}.mono,.num{font-family:var(--mono);font-size:.9em}.masthead{border-bottom:1px solid var(--ink);background:var(--paper)}.masthead-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 32px;padding-top:16px;padding-bottom:14px;display:flex}.wordmark{color:var(--ink);align-items:center;gap:12px;text-decoration:none;display:flex}.logo{width:28px;height:28px;fill:var(--ink)}.logo .logo-bar{fill:var(--accent)}.wm-name{font-family:var(--serif);letter-spacing:-.01em;font-size:21px;font-weight:700;line-height:1.1;display:block}.wm-desc{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-size:11.5px;display:block}.mainnav{flex-wrap:wrap;gap:2px 22px;font-size:14.5px;display:flex}.mainnav a{color:var(--ink-2);border-bottom:2px solid #0000;padding:4px 0;text-decoration:none}.mainnav a:hover{color:var(--ink)}.mainnav a[aria-current]{color:var(--ink);border-bottom-color:var(--accent)}.crumbs{color:var(--muted);flex-wrap:wrap;gap:6px;padding-top:16px;font-size:13px;display:flex}.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{text-decoration:underline}main{padding-top:20px;padding-bottom:72px}h1,h2,h3{font-family:var(--serif);color:var(--ink);letter-spacing:-.012em;font-weight:600}h1{margin:10px 0 14px;font-size:clamp(30px,4.2vw,44px);font-weight:700;line-height:1.12}h2{margin:44px 0 12px;font-size:25px;line-height:1.25}h3{margin:28px 0 8px;font-size:19px;line-height:1.3}.kicker{letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0;font-size:12px;font-weight:600}.dek{font-family:var(--serif);color:var(--ink-2);max-width:760px;margin:0 0 18px;font-size:20px;line-height:1.5}.meta{color:var(--muted);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);flex-wrap:wrap;gap:4px 18px;margin:18px 0 8px;padding:10px 0;font-size:13.5px;display:flex}.prose{max-width:var(--read)}.prose p,.prose li{color:var(--ink)}.prose h2{border-top:1px solid var(--rule);padding-top:6px}.prose ul,.prose ol{padding-left:1.3em}.prose li{margin:4px 0}.prose strong{font-weight:600}.summary{background:var(--surface);border:1px solid var(--rule);border-left:3px solid var(--accent-2);max-width:var(--read);margin:22px 0 8px;padding:16px 20px}.summary:before{content:"Summary";letter-spacing:.1em;text-transform:uppercase;color:var(--accent-2);margin-bottom:6px;font-size:11.5px;font-weight:600;display:block}.summary p{margin:0}.summary p+p{margin-top:8px}.note{background:var(--warn);border:1px solid var(--rule);max-width:var(--read);padding:12px 16px;font-size:14.5px}figure{margin:26px 0}figcaption,.caption{color:var(--muted);max-width:var(--read);margin:8px 0 0;font-size:13.5px}figcaption b,.caption b{color:var(--ink);font-weight:600}.table-scroll{-webkit-overflow-scrolling:touch;border-top:2px solid var(--ink);border-bottom:1px solid var(--ink);overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14.5px}th,td{text-align:left;vertical-align:top;border-bottom:1px solid var(--rule-2);padding:9px 12px 9px 0}th{letter-spacing:.03em;text-transform:uppercase;color:var(--ink-2);border-bottom:1px solid var(--ink);font-size:12.5px;font-weight:600}tr:last-child td{border-bottom:0}.prose table{margin:0}.prose .table-scroll{margin:20px 0}table.wide{min-width:980px}table.wide td:first-child{min-width:170px}td.num{white-space:nowrap}.home-intro{border-bottom:1px solid var(--rule);grid-template-columns:1.35fr 1fr;align-items:center;gap:40px;padding:18px 0 28px;display:grid}@media (width<=820px){.home-intro{grid-template-columns:1fr;gap:20px}}.home-intro h1{font-size:clamp(32px,4.6vw,50px)}.diagram{width:100%;height:auto}.diagram .cell{fill:var(--surface);stroke:var(--ink);stroke-width:1.5px}.diagram .cell-hot{fill:var(--accent);fill-opacity:.14;stroke:var(--accent);stroke-width:1.5px}.diagram .barrier{fill:var(--accent-2);fill-opacity:.18;stroke:var(--accent-2);stroke-width:1.2px}.diagram .lbl{font:500 11px var(--sans);fill:var(--muted);letter-spacing:.04em}.diagram .flux{stroke:var(--accent);stroke-width:2px;fill:none;marker-end:url(#arr)}.diagram .flux-weak{stroke:var(--accent);stroke-width:1.2px;stroke-dasharray:3 3;fill:none;opacity:.6}.sections{border-bottom:1px solid var(--rule);grid-template-columns:repeat(3,1fr);display:grid}@media (width<=820px){.sections{grid-template-columns:1fr}}.section-link{color:var(--ink);padding:22px 24px 22px 0;text-decoration:none;display:block}.sections .section-link+.section-link{border-left:1px solid var(--rule);padding-left:24px}@media (width<=820px){.sections .section-link+.section-link{border-left:0;border-top:1px solid var(--rule);padding-left:0}}.section-link .no{font-family:var(--mono);color:var(--accent);font-size:12.5px}.section-link h2{border:0;margin:4px 0 6px;padding:0;font-size:22px}.section-link p{color:var(--ink-2);margin:0;font-size:15px}.section-link:hover h2{color:var(--accent-2)}.two-col{grid-template-columns:1fr 1fr;gap:48px;display:grid}@media (width<=820px){.two-col{grid-template-columns:1fr;gap:8px}}.list-plain{margin:0;padding:0;list-style:none}.list-plain li{border-bottom:1px solid var(--rule-2);padding:12px 0}.list-plain a{font-family:var(--serif);color:var(--ink);font-size:17.5px;font-weight:600;text-decoration:none}.list-plain a:hover{color:var(--accent-2);text-decoration:underline}.list-plain .small{margin-top:2px;display:block}.timeline{margin:0;padding:0;list-style:none}.timeline li{border-bottom:1px solid var(--rule-2);grid-template-columns:96px 1fr;gap:14px;padding:11px 0;display:grid}.timeline time{font-family:var(--mono);color:var(--accent);padding-top:2px;font-size:13px}.timeline .upcoming time{font-weight:500}.article{grid-template-columns:minmax(0,1fr) 240px;gap:56px;display:grid}@media (width<=980px){.article{grid-template-columns:1fr;gap:0}.aside{display:none}}.aside{align-self:start;padding-top:6px;font-size:14px;position:sticky;top:24px}.aside .aside-h{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 8px;font-size:11.5px;font-weight:600}.toc{border-left:1px solid var(--rule);margin:0 0 28px;padding:0;list-style:none}.toc a{color:var(--ink-2);padding:4px 0 4px 12px;line-height:1.35;text-decoration:none;display:block}.toc a:hover{color:var(--accent-2)}.cite{background:var(--surface);border:1px solid var(--rule);max-width:var(--read);margin-top:36px;padding:14px 16px;font-size:14px}.cite p{margin:4px 0 0}.cite code{font-family:var(--mono);word-break:break-word;font-size:12.5px}.refs{color:var(--ink-2);padding-left:1.5em;font-size:14px}.refs li{word-break:break-word;margin:6px 0}details{border-top:1px solid var(--rule);padding:12px 0}details:last-of-type{border-bottom:1px solid var(--rule)}summary{cursor:pointer;font-weight:600;font-family:var(--serif);font-size:17px}details p{color:var(--ink-2);margin:8px 0 0}.facts{border-top:2px solid var(--ink);border-bottom:1px solid var(--ink);max-width:var(--read);grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:0;margin:18px 0 8px;display:grid}.facts div{padding:10px 14px 10px 0}.facts dt{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-size:11.5px}.facts dd{margin:2px 0 0;font-weight:500}.chart{width:100%;height:auto;display:block}.chart .axis{stroke:var(--rule)}.chart .tick{font:11px var(--mono);fill:var(--muted)}.chart .name{font:500 13px var(--sans);fill:var(--ink)}.chart .bar-rt{fill:var(--accent-2)}.chart .bar-hot{fill:var(--accent)}.chart .grid{stroke:var(--rule-2)}.legend{color:var(--ink-2);flex-wrap:wrap;gap:6px 20px;margin-top:6px;font-size:13px;display:flex}.legend i{vertical-align:middle;width:18px;height:8px;margin-right:6px;display:inline-block}.spec{border-top:1px solid var(--ink);max-width:var(--read);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin:14px 0;display:grid}.spec div{border-bottom:1px solid var(--rule-2);padding:8px 14px 8px 0}.spec dt{letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-size:11.5px}.spec dd{margin:2px 0 0;font-size:14.5px}.mat{padding-top:8px}.mat .role{letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-size:12px;font-weight:600}.pc{max-width:var(--read);grid-template-columns:1fr 1fr;gap:28px;display:grid}@media (width<=640px){.pc{grid-template-columns:1fr;gap:0}}.pc h3{font-size:15px;font-family:var(--sans);text-transform:uppercase;letter-spacing:.06em;color:var(--ink-2)}.site-footer{border-top:1px solid var(--ink);background:var(--surface);padding:32px 0 20px;font-size:14px}.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;display:grid}@media (width<=820px){.footer-grid{grid-template-columns:1fr 1fr}.footer-about{grid-column:1/-1}}.footer-grid a{color:var(--ink-2);word-break:break-word;padding:3px 0;text-decoration:none;display:block}.footer-grid a:hover{color:var(--accent-2);text-decoration:underline}.footer-name{font-family:var(--serif);margin:0 0 6px;font-size:18px;font-weight:700}.footer-about p{color:var(--ink-2);max-width:460px;margin:4px 0}.footer-h{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 6px;font-size:11.5px;font-weight:600}.footer-base{border-top:1px solid var(--rule);margin-top:26px;padding-top:14px}dl.glossary{max-width:var(--read)}dl.glossary dt{font-family:var(--serif);margin-top:22px;font-size:18px;font-weight:600}dl.glossary dd{color:var(--ink-2);margin:4px 0 0}code{font-family:var(--mono);background:var(--tint);border-radius:3px;padding:1px 5px;font-size:.88em}pre{font-family:var(--mono);background:var(--tint);border:1px solid var(--rule);padding:14px 16px;font-size:13px;overflow-x:auto}pre code{background:0 0;padding:0}@media print{.masthead nav,.aside,.site-footer,.crumbs{display:none}body{background:#fff}}.mainnav .lang-switch{border:1px solid var(--rule);border-radius:2px;margin-left:4px;padding:2px 10px}.mainnav .lang-switch:hover{border-color:var(--ink)}:lang(zh) body,body:lang(zh){font-family:IBM Plex Sans,PingFang SC,Hiragino Sans GB,Noto Sans SC,Microsoft YaHei,sans-serif;line-height:1.8}:lang(zh) h1,:lang(zh) h2,:lang(zh) h3,:lang(zh) .dek,:lang(zh) .wm-desc,:lang(zh) summary,:lang(zh) .list-plain a,:lang(zh) dl.glossary dt{font-family:"Source Serif 4",Noto Serif SC,Songti SC,STSong,SimSun,serif}:lang(zh) .wm-desc,:lang(zh) .kicker,:lang(zh) th,:lang(zh) .footer-h,:lang(zh) .aside-h,:lang(zh) .facts dt,:lang(zh) .spec dt{letter-spacing:.04em}:lang(zh) .summary:before{content:"摘要"}.sourced{color:var(--muted);font-size:12px}.badge{font:600 11px/1.6 var(--sans);letter-spacing:.06em;text-transform:uppercase;border:1px solid;border-radius:2px;padding:0 6px;display:inline-block}.badge.ok{color:#2f6f3e}.badge.pending{color:#9a6a12}@media (prefers-color-scheme:dark){.badge.ok{color:#7cc48d}.badge.pending{color:#e0b25a}}sup.cite-ref a{font-size:11px;font-family:var(--mono);text-decoration:none}table.wide{table-layout:fixed;min-width:1180px}table.wide th:first-child,table.wide td:first-child{width:190px}table.wide td,table.wide th{min-width:0}table.wide td.num{white-space:normal}.form fieldset{border:0;border-top:1px solid var(--rule);margin:18px 0 0;padding:12px 0 4px}.form legend{font-family:var(--serif);padding:0 8px 0 0;font-size:18px;font-weight:600}.form label{color:var(--ink-2);margin:12px 0;font-size:14.5px;font-weight:500;display:block}.form input:not([type=checkbox]),.form select,.form textarea{width:100%;font:16px var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--rule);border-radius:2px;margin-top:4px;padding:9px 10px;display:block}.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--accent-2);outline-offset:1px}.form label.check{align-items:flex-start;gap:10px;font-weight:400;display:flex}.form label.check input{margin-top:4px}.form button{font:600 15px var(--sans);color:#fff;background:var(--accent);cursor:pointer;border:0;border-radius:2px;padding:11px 22px}.form button:hover{filter:brightness(1.08)}.hp{width:1px;height:1px;position:absolute;left:-9999px;overflow:hidden}.cta{border:1px solid var(--rule);border-left:3px solid var(--accent);background:var(--surface);max-width:var(--read);margin:28px 0;padding:14px 18px}.cta p{margin:0 0 6px}
