@font-face{font-family:'Inter Fallback';src:local('Arial'),local('Helvetica Neue'),local('Liberation Sans');ascent-override:90.20%;descent-override:22.48%;line-gap-override:0.00%;size-adjust:107.40%;}
@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/inter-var-latin-v1.woff2) format('woff2');unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Inter;font-style:normal;font-weight:100 900;font-display:swap;src:url(/assets/inter-var-latin-ext-v1.woff2) format('woff2');unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
:root{--ink:#14212d;--muted:#5c6872;--paper:#f7f8f7;--line:#d7ddda;--teal:#007d78;--yellow:#f6c651;--red:#cf4d3f;--max:1120px}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 Inter,'Inter Fallback',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif}a{color:inherit}a:hover{color:var(--teal)}.site-header,main,footer{max-width:var(--max);margin:auto}.site-header{min-height:76px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{font-weight:700;font-size:22px;text-decoration:none}nav{display:flex;flex-wrap:wrap;gap:18px}nav a{text-decoration:none;color:var(--muted)}main{min-height:calc(100vh - 160px)}.hero{padding:80px 0 52px;max-width:770px}.eyebrow{text-transform:uppercase;letter-spacing:1.4px;font-size:12px;font-weight:bold;color:var(--teal);margin:0 0 12px}h1{font-size:48px;line-height:1.08;margin:0 0 22px;letter-spacing:0}h2{letter-spacing:0}.hero>p:not(.eyebrow){font-size:21px;color:var(--muted);max-width:680px}.search{margin-top:32px;position:relative}.search label{display:block;font-weight:bold;margin-bottom:8px}.search-controls{display:grid;grid-template-columns:1fr 190px}.search input,.search select{width:100%;border:1px solid var(--ink);background:white;padding:14px 16px;font-size:16px}.search input{border-radius:4px 0 0 4px}.search select{border-left:0;border-radius:0 4px 4px 0}.search input:focus,.search select:focus{outline:3px solid #007d7840;outline-offset:1px}#search-results{position:absolute;z-index:2;width:100%;max-height:360px;overflow:auto;background:white;box-shadow:0 10px 26px #14212d22;border-radius:0 0 4px 4px}#search-results[hidden]{display:none}#search-results a{display:block;padding:11px 16px;text-decoration:none;border-top:1px solid var(--line)}#search-results a[aria-selected="true"]{background:#e9f4f2;color:var(--teal)}#search-results small{display:block;color:var(--muted)}.search-status{margin:0;padding:13px 16px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.stats a{padding:22px;text-decoration:none;border-right:1px solid var(--line)}.stats a:first-child{padding-left:0}.stats a:last-child{border:0}.stats strong,.stats span{display:block}.stats strong{font-size:28px}.stats span{color:var(--muted)}.domain-groups{padding:54px 0}.domain-group{display:grid;grid-template-columns:220px 1fr;gap:38px;padding:28px 0;border-top:1px solid var(--line)}.domain-group h2{margin:0;font-size:22px}.domain-links{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.domain-link{display:block;padding:17px;background:#fff;border:1px solid var(--line);border-radius:6px;text-decoration:none}.domain-link strong,.domain-link span{display:block}.domain-link span{color:var(--muted);font-size:14px}.feature-band{display:grid;grid-template-columns:1fr 1fr;gap:64px;padding:72px 0}.feature-band h2{font-size:30px;line-height:1.2;margin:0}.feature-band>p{color:var(--muted);font-size:18px}.page-intro{padding:58px 0 32px;border-bottom:1px solid var(--line)}.page-intro>p:last-child{color:var(--muted);font-size:18px}.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;padding:32px 0 70px}.card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:6px;background:#fff;padding:22px;text-decoration:none;min-height:176px}.card h2{margin:0 0 8px;font-size:22px}.card p{color:var(--muted);margin:0 0 20px}.card span{margin-top:auto;font-weight:bold;color:var(--teal)}.pagination{display:flex;justify-content:center;align-items:center;gap:24px;padding:0 0 70px}.pagination a{font-weight:bold;color:var(--teal)}.record{max-width:920px;padding:64px 0}.prose{max-width:780px;padding:64px 0}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px;color:var(--muted);font-size:14px}.breadcrumbs a{color:var(--teal)}.record-summary{font-size:19px;color:var(--muted);margin:0 0 30px}.facts{margin-top:34px}.facts h2{font-size:22px}.record dl,.source-panel dl{display:grid;grid-template-columns:190px 1fr;border-top:1px solid var(--line)}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:28px 0 38px}.metric{padding:18px;background:#fff;border:1px solid var(--line);border-radius:6px}.metric strong,.metric span{display:block}.metric strong{font-size:24px;color:var(--teal)}.metric span{font-size:13px;color:var(--muted)}.profile-section{margin-top:54px;padding-top:34px;border-top:1px solid var(--line)}.indicator-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin-top:26px}.indicator-panel{min-width:0;padding-top:18px;border-top:3px solid var(--teal)}.indicator-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:18px}.indicator-heading h3{margin:0;font-size:21px}.indicator-heading>p{margin:0;text-align:right}.indicator-heading strong,.indicator-heading span{display:block}.indicator-heading strong{font-size:18px}.indicator-heading span{color:var(--muted);font-size:13px}.indicator-panel>p{min-height:52px;color:var(--muted);font-size:14px}.indicator-data{margin-top:12px}.indicator-data summary{cursor:pointer;font-weight:bold;color:var(--teal)}.indicator-data .table-scroll{margin-top:10px}.source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px}.source-card{padding:20px;background:#fff;border:1px solid var(--line);border-radius:6px}.source-card h3{margin:0 0 12px;font-size:18px}.source-card dl{display:grid;grid-template-columns:120px 1fr}.source-card dt,.source-card dd{padding:8px 0;font-size:13px}.recipe-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:24px}.recipe{padding:22px;background:#fff;border:1px solid var(--line);border-radius:6px}.recipe h3{margin:0 0 4px;font-size:22px}.recipe h4{margin-bottom:6px}.recipe ul,.recipe ol{padding-left:22px}.recipe small{display:block;margin-top:16px;color:var(--muted)}.related-section{margin-top:54px;padding-top:34px;border-top:1px solid var(--line)}.section-heading{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,1fr) auto;gap:28px;align-items:end}.section-heading h2{margin:0;font-size:27px}.section-heading>p{margin:0;color:var(--muted)}.section-link{font-weight:bold;color:var(--teal);white-space:nowrap}.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:22px}.related-card{display:block;padding:17px;background:#fff;border:1px solid var(--line);border-radius:6px;text-decoration:none}.related-card strong,.related-card span,.related-card small{display:block}.related-card span{margin-top:4px;color:var(--muted)}.related-card small{margin-top:7px;color:var(--teal)}.tool,.source-panel,.faqs{margin-top:38px;padding-top:28px;border-top:1px solid var(--line)}.tool h2,.source-panel h2,.faqs h2{font-size:22px}.live-value{font-size:28px;font-weight:bold}.tool form{display:flex;flex-wrap:wrap;align-items:end;gap:16px}.tool label{display:grid;gap:6px;font-weight:bold}.tool input,.tool select{min-height:42px;padding:9px;border:1px solid var(--line);border-radius:4px;background:#fff;font:inherit}.tool form>p{margin:0 0 7px}.tool-note{color:var(--muted);font-size:14px}.faqs details{padding:13px 0;border-bottom:1px solid var(--line)}.faqs summary{font-weight:bold;cursor:pointer}.table-scroll{max-height:420px;overflow:auto;border:1px solid var(--line)}.fact-table{width:100%;border-collapse:collapse;background:#fff}.fact-table th,.fact-table td{padding:8px 10px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}.fact-table th{width:65%;font-weight:normal}dt,dd{margin:0;padding:15px 0;border-bottom:1px solid var(--line)}dt{font-weight:bold}.record dd a{overflow-wrap:anywhere}.record-navigation{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:48px;padding-top:28px;border-top:1px solid var(--line)}.record-navigation a{display:block;padding:16px;background:#fff;border:1px solid var(--line);border-radius:6px}.record-navigation span,.record-navigation strong{display:block}.record-navigation span{font-size:13px;color:var(--muted)}.record-navigation strong{overflow-wrap:anywhere}.notice{margin-top:30px;padding:16px;border-left:4px solid var(--yellow);background:#fff}.prose p{font-size:18px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:14px}@media(max-width:760px){.site-header,main,footer{margin-left:20px;margin-right:20px}.site-header{padding:14px 0;align-items:flex-start;flex-direction:column;gap:6px}nav{gap:13px;font-size:14px}.hero{padding:48px 0 36px}h1{font-size:37px}.hero>p:not(.eyebrow){font-size:18px}.stats{grid-template-columns:1fr 1fr}.stats a{padding:16px;border-bottom:1px solid var(--line)}.stats a:first-child{padding-left:16px}.stats a:nth-child(2){border-right:0}.feature-band,.card-grid,.domain-group,.domain-links,.section-heading,.related-grid,.indicator-grid,.source-grid,.recipe-grid{grid-template-columns:1fr;gap:22px}.metrics{grid-template-columns:1fr 1fr}.domain-group{gap:10px}.search-controls{grid-template-columns:1fr}.search input{border-radius:4px 4px 0 0}.search select{border-left:1px solid var(--ink);border-top:0;border-radius:0 0 4px 4px}.feature-band{padding:50px 0}.record,.prose{padding:45px 0}.record dl{grid-template-columns:1fr}.record-navigation{grid-template-columns:1fr}dt{padding-bottom:3px;border-bottom:0}dd{padding-top:3px}.page-intro{padding-top:42px}.card-grid{padding-top:20px}}

/* AdSense 广告位：CSP 无 style-src，内联 style 会被 default-src 拦截，
   因此 display/间距全部走 class，不在 ins 上写 style 属性。 */
.ad-slot {
  margin: 24px 0;
  padding: 12px 0;
  text-align: center;
  border-top: 1px solid #e5e7eb;
}

.ad-slot .ad-label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #6b7280;
}

.ad-slot ins.adsbygoogle {
  display: block;
  width: 100%;
  min-height: 90px;
}

@media (min-width: 768px) {
  .ad-slot ins.adsbygoogle { min-height: 100px; }
}

/* Trend chart: axes, scale and hover tooltips.
   The old markup was a bare polyline with no scale, so a reader could not
   tell what the line meant. The gridlines, labels and hover bands below are
   all SVG plus CSS -- no JavaScript, so the numbers still work when the
   script is blocked. */
.trend-chart{display:block;width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:4px}
.trend-chart polyline{fill:none;stroke:var(--teal);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.chart-grid{stroke:#e6eae8;stroke-width:1}
.chart-tick{stroke:#b4bdb9;stroke-width:1}
.chart-ylabel,.chart-xlabel,.chart-unit{font-size:10px;fill:var(--muted);font-weight:500}
.chart-unit{letter-spacing:.06em;text-transform:uppercase;fill:var(--ink)}
.chart-extreme{fill:#fff;stroke:var(--teal);stroke-width:2}
.chart-hover{cursor:crosshair;outline:none}
.chart-hover>rect{fill:transparent}
.chart-dot{fill:var(--teal);stroke:#fff;stroke-width:1.5;opacity:0}
.chart-tip{opacity:0;pointer-events:none}
.chart-tip rect{fill:#14212d;opacity:.95}
.chart-tip text{font-size:10px;fill:#f7f8f7}
.chart-tip .chart-tip-period{fill:#a9b4bd}
.chart-tip .chart-tip-value{font-size:11px;font-weight:700;fill:#fff}
.chart-hover:hover .chart-dot,.chart-hover:focus .chart-dot{opacity:1}
.chart-hover:hover .chart-tip,.chart-hover:focus .chart-tip{opacity:1}
.chart-hover:focus>rect{stroke:var(--teal);stroke-width:1;stroke-dasharray:3 3}

/* Derived reference blocks for postal codes and time zones. */
.geo-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:24px}
.geo-cell{padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:6px}
.geo-cell span{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.geo-cell strong{font-size:16px;font-weight:600;overflow-wrap:anywhere}
.hierarchy{list-style:none;margin:24px 0 0;padding:0;counter-reset:hierarchy}
.hierarchy li{position:relative;padding:14px 18px 14px 46px;background:#fff;border:1px solid var(--line);border-radius:6px;margin-bottom:8px}
.hierarchy li::before{counter-increment:hierarchy;content:counter(hierarchy);position:absolute;left:16px;top:14px;width:20px;height:20px;border-radius:50%;background:var(--teal);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.hierarchy-label{display:block;font-size:13px;color:var(--muted);margin-bottom:2px}
.hierarchy strong{font-size:17px;font-weight:600}
.hierarchy code{margin-left:10px;font-size:13px;color:var(--muted);background:var(--paper);padding:2px 6px;border-radius:3px}
.format-list{display:grid;grid-template-columns:190px 1fr;margin-top:24px;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.format-list dt{padding:14px 18px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--line);background:#fbfcfb}
.format-list dd{padding:14px 18px;margin:0;border-bottom:1px solid var(--line)}
.format-list dt:last-of-type,.format-list dd:last-of-type{border-bottom:0}
.format-list code{background:var(--paper);padding:3px 8px;border-radius:3px;letter-spacing:.06em}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.chip{display:inline-block;padding:7px 13px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:14px;font-weight:600;letter-spacing:.04em}
@media(max-width:760px){.geo-grid{grid-template-columns:1fr}.format-list{grid-template-columns:1fr}.format-list dt{border-bottom:0;padding-bottom:0}.hierarchy li{padding-left:42px}}