:root{--brand:#08979C;--brand-2:#13A8A8;--brand-50:#EAF7F6;--brand-100:#CDEEEB;--ink:#16232A;--ink-2:#3B4A52;--muted:#6A7880;
--line:#E3E9EC;--soft:#F6F8F9;--warn:#9A5B00;--warn-bg:#FFF6E5;--warn-line:#F6DDAE;--danger:#B42318;--danger-bg:#FEF3F2;
--danger-line:#FBD5D0;--ok:#1E7B4D;--ok-bg:#ECF8F1;--ok-line:#C9EBD7;--side:272px;--top:64px;--radius:12px}
*{box-sizing:border-box}html{scroll-padding-top:calc(var(--top) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;font:400 16px/1.75 'Be Vietnam Pro',-apple-system,'Segoe UI',Roboto,Arial,sans-serif;color:var(--ink-2);background:#fff;
-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}
b,strong{color:var(--ink);font-weight:600}
/* Đầu trang */
.top{position:sticky;top:0;z-index:40;height:var(--top);background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:16px;height:100%;max-width:1440px;margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:center;flex:none}.brand img{display:block;height:40px;width:auto}.brand:hover{text-decoration:none}
.brand-doc{flex:none;padding-left:16px;border-left:1px solid var(--line);font-weight:500;color:var(--ink);font-size:15px;line-height:24px}
.search{position:relative;margin-left:auto;width:320px}
.search input{width:100%;height:38px;padding:0 40px 0 38px;border:1px solid var(--line);border-radius:10px;background:var(--soft);font:inherit;font-size:14px;color:var(--ink);outline:none;transition:border-color .15s,background .15s}
.search input:focus{background:#fff;border-color:var(--brand-2);box-shadow:0 0 0 3px var(--brand-50)}
.search>svg{position:absolute;left:12px;top:11px;width:16px;height:16px;color:var(--muted)}
.search kbd{position:absolute;right:10px;top:9px;padding:0 6px;border:1px solid var(--line);border-radius:5px;background:#fff;font-family:inherit;font-size:12px;font-weight:500;line-height:18px;color:var(--muted)}
.search input:not(:placeholder-shown)~kbd{display:none}
.results{position:absolute;top:44px;left:0;right:0;max-height:420px;overflow:auto;padding:6px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 32px -12px rgba(16,35,42,.25)}
.results a{display:block;padding:8px 10px;border-radius:8px;color:var(--ink);line-height:1.4}.results a:hover,.results a.on{background:var(--brand-50);text-decoration:none}
.results small{display:block;color:var(--muted);font-size:12.5px}.results .empty{padding:10px;color:var(--muted);font-size:14px}
.open-app{flex:none;display:inline-flex;align-items:center;gap:6px;height:38px;padding:0 14px;border-radius:10px;background:var(--brand);color:#fff;font-weight:500;font-size:14px}
.open-app:hover{background:#077A7E;text-decoration:none}.open-app svg{width:14px;height:14px}
.menu-btn{display:none;flex:none;width:38px;height:38px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);cursor:pointer}
.menu-btn svg{width:18px;height:18px;display:block;margin:auto}
/* Bố cục */
.layout{display:grid;grid-template-columns:var(--side) minmax(0,1fr) 232px;max-width:1440px;margin:0 auto}
nav.side{position:sticky;top:var(--top);height:calc(100vh - var(--top));overflow:auto;padding:24px 16px 48px 24px;border-right:1px solid var(--line)}
nav.side h4{margin:22px 10px 6px;font-size:11.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
nav.side h4:first-child{margin-top:0}
nav.side a{display:block;padding:6px 10px;border-radius:8px;color:var(--ink-2);font-size:14.5px;line-height:1.45}
nav.side a:hover{background:var(--soft);color:var(--ink);text-decoration:none}
nav.side a.side-app{display:none}
nav.side a.on{background:var(--brand-50);color:var(--brand);font-weight:600}
main.content{min-width:0;padding:40px 56px 72px}
article{max-width:780px}
.crumb{margin-bottom:10px;font-size:13px;font-weight:500;color:var(--brand)}
aside.toc{position:sticky;top:var(--top);align-self:start;max-height:calc(100vh - var(--top));overflow:auto;padding:40px 24px 40px 0;font-size:13.5px;line-height:1.45}
aside.toc b{display:block;margin-bottom:10px;font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:600}
aside.toc a{display:block;padding:5px 0 5px 12px;margin-left:-1px;border-left:1px solid var(--line);color:var(--muted)}
aside.toc a:hover{color:var(--ink);text-decoration:none}aside.toc a.on{color:var(--brand);border-left-color:var(--brand);font-weight:500}
/* Chữ */
h1{margin:0 0 12px;font-size:36px;line-height:1.2;font-weight:700;letter-spacing:-.02em;color:var(--ink)}
.lead{margin:0 0 32px;font-size:18.5px;line-height:1.65;color:var(--muted)}
h2{position:relative;margin:56px 0 14px;font-size:25px;line-height:1.3;font-weight:700;letter-spacing:-.015em;color:var(--ink)}
h3{margin:32px 0 10px;font-size:19px;line-height:1.4;font-weight:600;color:var(--ink)}
h2 .anchor{position:absolute;left:-26px;top:0;padding-right:8px;color:var(--brand-100);font-weight:500;opacity:0}
h2:hover .anchor{opacity:1}
p{margin:0 0 16px}ul,ol{padding-left:22px;margin:0 0 18px}li{margin:4px 0}li::marker{color:var(--brand-2)}
.ui,kbd{display:inline-block;padding:0 7px;margin:0 1px;border:1px solid var(--line);border-radius:6px;background:var(--soft);
font-family:inherit;font-size:.9em;font-weight:500;line-height:1.6;color:var(--ink);white-space:nowrap;vertical-align:baseline}
.fill{background:#FFF1B8;padding:0 4px;border-radius:4px}
/* Bước */
ol.steps{counter-reset:s;list-style:none;padding:0;margin:18px 0 24px}
ol.steps>li{counter-increment:s;position:relative;padding:1px 0 12px 42px;margin:0}
ol.steps>li::before{content:counter(s);position:absolute;left:0;top:2px;width:26px;height:26px;border-radius:50%;background:var(--brand-50);
color:var(--brand);font-weight:700;font-size:13px;line-height:26px;text-align:center}
ol.steps>li:not(:last-child)::after{content:"";position:absolute;left:12.5px;top:32px;bottom:2px;width:1px;background:var(--brand-100)}
/* Ảnh */
figure{margin:24px 0 32px}
figure img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;
box-shadow:0 1px 2px rgba(16,35,42,.04),0 10px 30px -18px rgba(16,35,42,.28);cursor:zoom-in}
figure.phone img{max-width:340px}
figcaption{margin-top:10px;color:var(--muted);font-size:14px;line-height:1.55}
/* Khung ghi chú */
.note,.tip,.warn,.danger{position:relative;margin:22px 0;padding:14px 18px 14px 48px;border:1px solid;border-radius:var(--radius);font-size:15px;line-height:1.65}
.note{background:var(--brand-50);border-color:var(--brand-100)}.tip{background:var(--ok-bg);border-color:var(--ok-line)}
.warn{background:var(--warn-bg);border-color:var(--warn-line)}.danger{background:var(--danger-bg);border-color:var(--danger-line)}
.note::before,.tip::before,.warn::before,.danger::before{content:"";position:absolute;left:17px;top:17px;width:18px;height:18px;
-webkit-mask:var(--ic) center/contain no-repeat;mask:var(--ic) center/contain no-repeat}
.note::before{background:var(--brand);--ic:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='9.5'/%3E%3Cpath d='M12 11v5M12 7.5v.01'/%3E%3C/svg%3E")}
.tip::before{background:var(--ok);--ic:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9.5'/%3E%3Cpath d='m8 12.5 2.7 2.7L16 9.8'/%3E%3C/svg%3E")}
.warn::before{background:var(--warn);--ic:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M10.3 3.9 2.4 17.6A2 2 0 0 0 4.1 20.6h15.8a2 2 0 0 0 1.7-3L13.7 3.9a2 2 0 0 0-3.4 0z'/%3E%3Cpath d='M12 9.5v4M12 17v.01'/%3E%3C/svg%3E")}
.danger::before{background:var(--danger);--ic:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='9.5'/%3E%3Cpath d='m15 9-6 6M9 9l6 6'/%3E%3C/svg%3E")}
.note>b:first-child,.tip>b:first-child,.warn>b:first-child,.danger>b:first-child{display:block;margin-bottom:2px;color:var(--ink)}
/* Bảng */
table{width:100%;border-collapse:separate;border-spacing:0;margin:18px 0 26px;font-size:14.5px;line-height:1.55;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
th,td{padding:10px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
th{background:var(--soft);font-weight:600;color:var(--ink);font-size:13.5px}tr:last-child td{border-bottom:0}
th+th,td+td{border-left:1px solid var(--line)}
.yes{color:var(--ok);font-weight:600}.no{color:#A3AEB4}
table.small{font-size:13.5px}table.small th,table.small td{padding:8px 10px}
/* Thẻ, luồng */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin:20px 0 28px}
.card{display:block;padding:18px 18px 16px;border:1px solid var(--line);border-radius:var(--radius);color:var(--ink-2);background:#fff;transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:var(--brand-2);box-shadow:0 10px 30px -18px rgba(8,151,156,.45);text-decoration:none}
.card b{display:block;margin-bottom:4px;font-size:16px;color:var(--ink)}.card span{display:block;color:var(--muted);font-size:14px;line-height:1.55}
.flow{display:flex;align-items:stretch;gap:10px;margin:20px 0 28px}.flow .arrow{align-self:center;color:var(--brand-2);font-size:20px}
.flow .node{flex:1;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;font-size:15px;line-height:1.55}
.flow .node.main{background:var(--brand-50);border-color:var(--brand-100)}.flow .node>b{display:block;margin-bottom:4px}
.flow .node span{font-size:14px;color:var(--muted)}.flow .node.wide{flex:none;width:100%}
blockquote.app{margin:20px 0;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--soft);font-size:15px}
blockquote.app ul{margin:6px 0 10px;padding-left:20px}
.noshot{color:var(--muted);font-style:italic}
.btn{display:inline-flex;align-items:center;margin:0 8px 8px 0;height:38px;padding:0 16px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);font-family:inherit;font-size:14.5px;font-weight:500;cursor:pointer}
.btn:hover{border-color:var(--brand-2);color:var(--brand);text-decoration:none}
/* Văn bản mẫu */
.doc{margin:20px 0;padding:36px 40px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;font-size:15.5px;box-shadow:0 10px 30px -22px rgba(16,35,42,.3)}
.doc h3{font-size:16.5px;margin:22px 0 6px}.doc-title{text-align:center;font-size:20px;margin:18px 0}
.doc-title span{display:block;font-size:16.5px;font-weight:600;margin-top:4px}
.opt{margin:14px 0;padding:4px 16px 10px;border:1px dashed #E3B341;border-radius:10px}.opt-tag{font-size:12px;font-weight:700;color:var(--warn);margin-top:8px}
.doc-org{font-size:14.5px;line-height:1.6}
.sign{margin:28px 0 10px auto;width:300px;text-align:center}.receipt{margin-top:28px;padding-top:16px;border-top:1px dashed var(--line)}
/* Chuyển trang, chân trang */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:780px;margin-top:64px}
.pager a{display:block;padding:14px 18px;border:1px solid var(--line);border-radius:var(--radius);color:var(--ink);font-weight:600;line-height:1.4}
.pager a:hover{border-color:var(--brand-2);text-decoration:none}.pager a small{display:block;margin-bottom:2px;font-size:12.5px;font-weight:500;color:var(--muted)}
.pager .next{text-align:right;grid-column:2}
footer.foot{display:flex;align-items:center;gap:14px;max-width:780px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted);font-size:13px;line-height:1.6}
footer.foot img{height:30px;flex:none}
/* Phóng ảnh */
#zoom{position:fixed;inset:0;z-index:60;display:none;align-items:center;justify-content:center;padding:24px;background:rgba(10,22,26,.86);cursor:zoom-out}
#zoom img{max-width:100%;max-height:100%;border-radius:10px;background:#fff}
/* Màn hẹp */
@media (max-width:1180px){.layout{grid-template-columns:var(--side) minmax(0,1fr)}aside.toc{display:none}main.content{padding:36px 40px 64px}}
@media (max-width:900px){.search{width:auto;flex:1}.brand-doc,.search kbd{display:none}}
@media (max-width:820px){:root{--top:58px}.top-in{padding:0 14px;gap:10px}.menu-btn{display:block}.brand img{height:32px}.open-app{display:none}.search input{padding-right:10px}
.layout{display:block}nav.side{display:none;position:fixed;inset:var(--top) 0 0 0;z-index:30;height:auto;background:#fff;border:0;padding:20px 18px 40px}
body.nav-open nav.side{display:block}nav.side a.side-app{display:block;margin-top:24px;text-align:center;background:var(--brand);color:#fff;font-weight:500;padding:10px}main.content{padding:24px 18px 56px}h1{font-size:28px}.lead{font-size:17px}h2{font-size:22px;margin-top:44px}
table{display:block;overflow-x:auto}.flow{flex-direction:column}.flow .arrow{transform:rotate(90deg)}.doc{padding:18px}.sign{width:auto}
.pager{grid-template-columns:1fr}.pager .next{grid-column:1}.results{position:fixed;left:14px;right:14px;top:calc(var(--top) - 4px)}}
@media print{.top,nav.side,aside.toc,.pager,#zoom,.print-actions,footer.foot{display:none!important}.layout{display:block}main.content{padding:0}
figure{break-inside:avoid}h2{break-after:avoid}.doc{border:0;padding:0;margin:0;box-shadow:none}article:has(.doc)>:not(.doc){display:none!important}.receipt{break-before:page}}