@font-face{font-family:Archivo Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/archivo-vietnamese-wght-normal.XAtsl5Q_.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Archivo Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/archivo-latin-ext-wght-normal.C4zznr8T.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Archivo Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/archivo-latin-wght-normal.E0tuGl4L.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Big Shoulders Display Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/big-shoulders-display-vietnamese-wght-normal.B-JM5mJH.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Big Shoulders Display Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/big-shoulders-display-latin-ext-wght-normal.EP2r9iG4.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Big Shoulders Display Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/big-shoulders-display-latin-wght-normal.Bn_gnr7w.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-cyrillic-ext-wght-normal.cHuGMAiY.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-cyrillic-wght-normal.DwHjdM4S.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-greek-wght-normal.ece1310W.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-vietnamese-wght-normal.D-yuW59g.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-latin-ext-wght-normal.CxNHBx-q.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Serif 4 Variable";font-style:normal;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-latin-wght-normal.D9elroTD.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-cyrillic-ext-wght-italic.BXuSHrjR.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-cyrillic-wght-italic.RLIThRd4.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-greek-wght-italic.F2ziEGcb.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-vietnamese-wght-italic.C3q834ic.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-latin-ext-wght-italic.CpkvI5hy.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Serif 4 Variable";font-style:italic;font-display:swap;font-weight:200 900;src:url(/_astro/source-serif-4-latin-wght-italic.D2yaqPoE.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}.area-stripe[data-astro-cid-3leezbuw]{height:6px;display:flex}.area-stripe[data-astro-cid-3leezbuw] span[data-astro-cid-3leezbuw]{flex:1}.site-header[data-astro-cid-fzpbxy5g]{background:var(--paper);border-bottom:2px solid var(--ink)}.wrap[data-astro-cid-fzpbxy5g]{padding-top:.85rem}.top[data-astro-cid-fzpbxy5g]{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:.75rem;display:flex}.brand[data-astro-cid-fzpbxy5g]{font-family:var(--font-display);text-transform:uppercase;letter-spacing:.01em;background:var(--ink);color:#fff;align-items:center;min-height:44px;padding:.1rem .55rem .05rem;font-size:clamp(1.7rem,5vw,2.4rem);font-weight:800;line-height:.95;text-decoration:none;display:inline-flex}.city[data-astro-cid-fzpbxy5g]{font-family:var(--font-display);letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft);white-space:nowrap;font-size:.85rem;font-weight:700}nav[data-astro-cid-fzpbxy5g]{border-top:1px solid var(--rule);margin-top:.6rem}ul[data-astro-cid-fzpbxy5g]{flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}li[data-astro-cid-fzpbxy5g]{border-right:1px solid var(--rule);margin:0}nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{min-height:44px;color:var(--ink);letter-spacing:.03em;text-transform:uppercase;align-items:center;padding:.5rem .85rem;font-size:.85rem;font-weight:700;text-decoration:none;display:flex}nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:hover{background:var(--paper-dim)}nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g][aria-current]{box-shadow:inset 0 -4px 0 var(--ink)}.site-footer[data-astro-cid-nns7i3if]{background:var(--paper-dim);color:var(--ink-soft);margin-top:2rem;font-size:.87rem}.wrap[data-astro-cid-nns7i3if]{padding-top:1.5rem;padding-bottom:.6rem}.cols[data-astro-cid-nns7i3if]{grid-template-columns:1fr;gap:1.5rem;display:grid}@media (width>=700px){.cols[data-astro-cid-nns7i3if]{grid-template-columns:repeat(2,1fr);gap:2rem}}@media (width>=1000px){.cols[data-astro-cid-nns7i3if]{grid-template-columns:repeat(4,1fr);gap:2rem}}h2[data-astro-cid-nns7i3if]{font-family:var(--font-display);text-transform:uppercase;letter-spacing:.04em;color:var(--ink-soft);border-bottom:none;margin:0 0 .3rem;padding-bottom:0;font-size:.8rem;font-weight:700}ul[data-astro-cid-nns7i3if]{margin:0;padding:0;list-style:none}li[data-astro-cid-nns7i3if]{margin:0}a[data-astro-cid-nns7i3if]{color:var(--ink-soft);align-items:center;min-height:44px;padding:.4rem 0;text-decoration:none;display:flex}a[data-astro-cid-nns7i3if]:hover{text-decoration:underline}.copyright[data-astro-cid-nns7i3if]{border-top:1px solid var(--rule);margin:1.4rem 0 0;padding-top:.6rem}:root{--paper:#fff;--paper-dim:#f1f3f5;--paper-notice:#eceef0;--ink:#15181c;--ink-soft:#4a5158;--rule:#d3d7db;--blue:#123f8a;--red:#b91c26;--red-ink:#8e141c;--paid:#f0b400;--a-hai-chau:#c8321f;--a-son-tra:#0b7a70;--a-ngu-hanh-son:#b45309;--a-thanh-khe:#1d5bb8;--a-lien-chieu:#237a35;--a-cam-le:#a8286b;--font-body:"Archivo Variable", system-ui, -apple-system, sans-serif;--font-display:"Big Shoulders Display Variable", "Archivo Variable", system-ui, sans-serif;--font-voice:"Source Serif 4 Variable", Georgia, "Times New Roman", serif;--measure:37.5rem}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--paper);color:var(--ink);font-family:var(--font-body);margin:0;font-size:1.0625rem;line-height:1.6}@media (width>=900px){body{font-size:1.125rem;line-height:1.65}}.voice{font-family:var(--font-voice);font-size:1.08em;line-height:1.55}a{color:var(--blue);text-underline-offset:.15em}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:2px solid var(--blue);outline-offset:2px}.wrap{max-width:var(--measure);margin:0 auto;padding-inline:1.1rem}main.page{padding-top:1.5rem;padding-bottom:3rem}@media (width>=1024px){.page.has-rail{grid-template-columns:minmax(0, var(--measure)) 17rem;justify-content:center;column-gap:3rem;display:grid}.wrap.has-rail{max-width:calc(var(--measure) + 17rem + 3rem)}.rail{align-self:start;position:sticky;top:1rem}}h1,h2,h3{color:var(--ink);font-weight:800}h1{overflow-wrap:anywhere;margin:.6rem 0 1rem;font-size:clamp(1.9rem,7vw,2.5rem);line-height:1.1}h2{border-bottom:3px solid var(--ink);margin:2.1rem 0 .7rem;padding-bottom:.35rem;scroll-margin-top:1rem;font-size:1.45rem;line-height:1.2}h3{margin:1.5rem 0 .5rem;scroll-margin-top:1rem;font-size:1.15rem;line-height:1.3}@media (width>=900px){h1{font-size:2.75rem}h2{font-size:1.6rem}h3{font-size:1.25rem}}p,ul,ol{margin:0 0 1rem}li+li{margin-top:.35rem}.muted,.meta{color:var(--ink-soft)}.meta{font-size:.85rem}.breadcrumb{margin-top:-.6rem;margin-bottom:.6rem}@media (width<=640px){.breadcrumb li[aria-current]{display:none}}.breadcrumb ol{color:var(--ink-soft);flex-wrap:wrap;margin:0;padding:0;font-size:.85rem;font-weight:600;list-style:none;display:flex}.breadcrumb li+li{margin-top:0}.breadcrumb li+li:before{content:"›";color:var(--ink);padding:0 .5rem}.breadcrumb a{color:var(--ink-soft);text-decoration-color:var(--rule)}.disclaimer{border-top:3px solid var(--ink);color:var(--ink-soft);margin-top:2.5rem;padding-top:1rem;font-size:.88rem}article table{border-collapse:collapse;font-variant-numeric:tabular-nums;max-width:100%;margin:1.25rem 0;font-size:.95rem;display:block;overflow-x:auto}article th,article td{text-align:left;vertical-align:baseline;border-bottom:1px dotted #8b9096;padding:.5rem .6rem}article th:first-child,article td:first-child{background:var(--paper);position:sticky;left:0}article thead th{background:var(--ink);color:#fff;font-family:var(--font-display);text-transform:uppercase;letter-spacing:.02em;font-size:.9rem;font-weight:800}article thead th:first-child{background:var(--ink)}article tbody tr:last-child td{border-bottom:2px solid var(--ink)}article td.num{text-align:right;color:var(--red-ink);white-space:nowrap;font-weight:700}article blockquote{border-left:4px solid var(--red);margin:1.5rem 0;padding:.2rem 0 .2rem 1rem;font-style:italic}article blockquote p{margin:0 0 .5rem}article blockquote cite{color:var(--ink-soft);margin-top:.35rem;font-size:.85rem;font-style:normal;display:block}.diagram svg{width:100%;height:auto;display:block}@media (width<=640px){.diagram{overflow-x:auto}.diagram svg{width:760px;max-width:none}}figure{margin:1.75rem 0}figcaption{color:var(--ink-soft);margin-top:.5rem;font-size:.875rem}figcaption .credit{font-size:.8rem;display:block}.photo img{border:2px solid var(--ink);width:100%;height:auto;display:block}.map iframe{aspect-ratio:4/3;border:2px solid var(--ink);width:100%;display:block}