:root{--text: #1b1b1b;--muted: #5f5f5f;--rule: #e6e3dd;--soft: #f7f5f1;--brand: #0f4d3a;--brand-dark: #0a3a2b;--amber: #e8a33d;--sans: "Be Vietnam Pro", system-ui, sans-serif;--serif: "Source Serif 4", Georgia, serif}*{box-sizing:border-box}body{margin:0;background:#fff;color:var(--text);font-family:var(--serif);font-size:19px;line-height:1.7}h1,h2,h3,h4,nav,button,input,label,table,.sans,.btn,.meta,.crumbs{font-family:var(--sans)}h1,h2,h3{line-height:1.25;letter-spacing:-.01em}h1{font-size:clamp(32px,5vw,44px);font-weight:800;margin:0 0 16px}h2{font-size:28px;font-weight:800;margin:48px 0 12px}h3{font-size:21px;font-weight:700;margin:32px 0 8px}a{color:var(--brand)}img{max-width:100%}.col{max-width:720px;margin:0 auto;padding:0 20px}.wide{max-width:1040px;margin:0 auto;padding:0 20px}.muted{color:var(--muted)}.lede{font-size:21px;margin:0 0 24px}hr{border:0;border-top:1px solid var(--rule);margin:56px 0}.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;font-weight:600;font-size:17px;padding:13px 22px;border-radius:8px;border:0;cursor:pointer}.btn:hover{background:var(--brand-dark)}.btn.secondary{background:#fff;color:var(--text);box-shadow:inset 0 0 0 1.5px var(--text)}.btn.secondary:hover{background:var(--soft)}.site-head{border-bottom:1px solid var(--rule)}.site-head .wide{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:16px;padding-bottom:16px;flex-wrap:wrap}.site-head nav{display:flex;gap:20px;font-size:15px;font-weight:500}.site-head nav a{color:var(--text);text-decoration:none}.site-head nav a:hover{color:var(--brand)}.site-foot{margin-top:96px;border-top:1px solid var(--rule);padding:28px 0 40px;font-family:var(--sans);font-size:14px;color:var(--muted)}.site-foot p{margin:0 0 6px}.prose p,.prose ul,.prose ol{margin:0 0 18px}.prose li{margin-bottom:6px}.prose table{width:100%;border-collapse:collapse;font-size:16px;margin:8px 0 24px;line-height:1.5}.prose th,.prose td{text-align:left;border-bottom:1px solid var(--rule);padding:9px 10px 9px 0;vertical-align:top}.prose th{font-weight:600;border-bottom:2px solid var(--text)}.prose pre{background:var(--soft);border-radius:8px;padding:16px 18px;white-space:pre-wrap;font-size:15px;line-height:1.6}.prose code{font-family:ui-monospace,Menlo,monospace;font-size:.9em}.prose blockquote{margin:0 0 18px;padding:4px 0 4px 18px;border-left:3px solid var(--brand);color:var(--muted)}.table-wrap{overflow-x:auto}.crumbs{font-size:14px;color:var(--muted);margin:32px 0 20px}.crumbs a{color:var(--muted)}.meta{font-size:14px;color:var(--muted);margin:0 0 24px}.box{background:var(--soft);border-radius:10px;padding:24px;margin:28px 0}.box h3{margin-top:0}.draft{background:#fff4d6;border:1px solid #f0d58a;border-radius:8px;padding:12px 16px;font-family:var(--sans);font-size:14px;margin:20px 0 0}.fill{background:#ffe3b3;border-radius:3px;padding:0 3px;font-family:var(--sans);font-size:.85em}form label{display:block;font-weight:600;font-size:15px;margin-bottom:6px}form input[type=text],form input[type=email],form input[type=tel]{width:100%;padding:12px 14px;border:1px solid #cfc9bd;border-radius:8px;font-size:17px;background:#fff;margin-bottom:16px;font-family:var(--sans)}form input:focus{outline:2px solid var(--brand);border-color:var(--brand)}.error{color:#b3261e;font-size:15px;min-height:1em;margin:0 0 8px;font-family:var(--sans)}.small{font-size:14px;color:var(--muted);font-family:var(--sans);margin:12px 0 0}.list{list-style:none;padding:0;margin:0}.list li{border-top:1px solid var(--rule);padding:18px 0}.list li:last-child{border-bottom:1px solid var(--rule)}.list a.title{font-family:var(--sans);font-weight:700;font-size:19px;text-decoration:none;color:var(--text)}.list a.title:hover{color:var(--brand)}.list p{margin:4px 0 0;font-size:17px;color:var(--muted)}.tag{font-family:var(--sans);font-size:13px;font-weight:600;color:var(--brand)}.bundles{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.bundle-card{border:1px solid var(--rule);border-radius:10px;padding:24px;display:flex;flex-direction:column}.bundle-card h3{margin:0 0 8px}.bundle-card p{font-size:17px;margin:0 0 16px}.bundle-card .price{margin-top:auto;font-family:var(--sans);font-weight:700;font-size:20px;margin-bottom:14px}.full{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;border:2px solid var(--brand);border-radius:10px;padding:24px;margin-bottom:20px;background:#f3f8f5}.full .price-col{font-family:var(--sans);font-size:22px}.full .price-col s{font-size:15px}.zalo{position:fixed;right:16px;bottom:16px;background:#0068ff;color:#fff;font-family:var(--sans);font-weight:600;font-size:15px;padding:11px 16px;border-radius:999px;text-decoration:none;box-shadow:0 6px 18px #0000002e;z-index:10}.zalo:hover{background:#0057d6}@media(max-width:860px){.bundles{grid-template-columns:1fr}}@media(max-width:560px){body{font-size:18px}.lede{font-size:19px}.site-head nav{gap:14px;font-size:14px}.btn{width:100%;text-align:center}.prose table{display:block;overflow-x:auto;font-size:15px}.prose th,.prose td{min-width:110px}}.doc{max-width:1100px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:minmax(0,760px) 230px;gap:56px;justify-content:center}.doc-main{min-width:0}.doc-main h2{scroll-margin-top:24px}.toc{position:sticky;top:24px;align-self:start;margin-top:120px;font-family:var(--sans);font-size:14px}.toc p{margin:0 0 10px;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.toc ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--rule)}.toc li a{display:block;padding:6px 0 6px 14px;margin-left:-2px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;line-height:1.35}.toc li a:hover{color:var(--text)}.toc li a.on{color:var(--brand);border-left-color:var(--brand);font-weight:600}.toc-cta{margin-top:18px;font-size:14px;padding:10px 14px;text-align:center;display:block}[id]{scroll-margin-top:24px}@media(max-width:1000px){.doc{grid-template-columns:minmax(0,760px)}.toc{display:none}}.logo[data-astro-cid-tvrurpns]{display:inline-flex;align-items:center;gap:9px;text-decoration:none;color:var(--text);font-family:var(--sans);font-weight:800;font-size:20px;letter-spacing:-.02em}.logo[data-astro-cid-tvrurpns]:hover span[data-astro-cid-tvrurpns]{color:var(--brand)}