:root{
  --bg:#050505;--bg-2:#0c0c0d;--bg-3:#151517;--line:#26262a;--line-2:#3a3a40;
  --text:#f4f4f5;--text-2:#c4c4cc;--text-3:#a1a1aa;
  --brand:#f26522;--brand-2:#ff7d3d;--brand-soft:rgba(242,101,34,.12);
  --ok:#4ade80;--ok-soft:rgba(74,222,128,.09);
  --warn:#fbbf24;--warn-soft:rgba(251,191,36,.09);
  --mono:"JetBrains Mono",Consolas,Menlo,monospace;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text-2);font:400 16px/1.7 Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
img{max-width:100%;display:block}
a{color:var(--brand-2);text-underline-offset:3px}
a:hover{color:#ffa06f}
h1,h2,h3{color:var(--text);line-height:1.25;margin:0;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 12px}
ul,ol{margin:0 0 12px;padding-left:22px}
li{margin:6px 0}
b,strong{color:var(--text);font-weight:600}
kbd{font:400 13px var(--mono);background:var(--bg-3);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;padding:1px 6px;color:var(--text);white-space:nowrap}
code{font:400 13.5px var(--mono);background:var(--bg-3);border-radius:4px;padding:1px 5px;color:var(--text)}
:focus-visible{outline:2px solid var(--brand-2);outline-offset:2px;border-radius:4px}

/* đầu trang */
.top{position:sticky;top:0;z-index:20;background:rgba(5,5,5,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top-in{max-width:1200px;margin:auto;padding:12px 24px;display:flex;align-items:center;gap:20px}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:18px;text-decoration:none}
.logo img{height:28px;width:auto}
.top nav{display:flex;gap:20px;margin-left:auto;align-items:center;font-size:14px}
.top nav a{color:var(--text-3);text-decoration:none}
.top nav a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brand);color:#fff!important;border:0;border-radius:8px;padding:10px 18px;font:600 14px/1.3 inherit;font-family:inherit;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-2)}
.btn.phu{background:transparent;border:1px solid var(--line-2);color:var(--text)!important}
.btn.phu:hover{background:var(--bg-3)}
.progress{height:2px;background:transparent}
.progress i{display:block;height:100%;width:0;background:var(--brand);transition:width .25s}

/* mở đầu */
.hero{background:radial-gradient(900px 380px at 12% -10%,rgba(242,101,34,.2),transparent 70%);border-bottom:1px solid var(--line)}
.hero-in{max-width:1200px;margin:auto;padding:64px 24px 48px}
.eyebrow{color:var(--brand-2);font-weight:600;font-size:14px;margin-bottom:12px}
.hero h1{font-size:clamp(32px,5vw,52px);max-width:820px;margin-bottom:18px}
.hero .lead{font-size:18px;max-width:720px;color:var(--text-2);margin-bottom:26px}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:48px}
.hero .cta:has(+ .ghi-chu-cta:not([hidden])){margin-bottom:14px}
.ghi-chu-cta{max-width:720px;margin:0 0 48px;padding:12px 16px;background:var(--brand-soft);border-left:3px solid var(--brand);border-radius:0 8px 8px 0;font-size:15px;line-height:1.6}
.yen-tam h2{font-size:24px;margin-bottom:18px}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:0;padding:0;list-style:none}
.facts li{margin:0;display:flex;flex-direction:column;padding:22px 20px;background:var(--bg-3);border:1px solid var(--line-2);border-top:3px solid var(--brand);border-radius:12px;font-size:15px;line-height:1.6;color:var(--text-2)}
.facts svg{width:30px;height:30px;color:var(--brand-2);margin-bottom:14px;flex:none}
.facts .ten{color:var(--text);font-size:18px;font-weight:700;line-height:1.3;margin-bottom:8px}
.facts .loi-ich{color:var(--brand-2);font-weight:600;line-height:1.45;margin-bottom:8px}
.facts .canh-bao{margin-top:12px;padding:10px 12px;background:var(--warn-soft);border-left:3px solid var(--warn);border-radius:0 6px 6px 0;font-size:14px;line-height:1.5}
.facts .canh-bao b{color:var(--warn)}

/* bố cục */
.wrap{max-width:1200px;margin:auto;padding:0 24px;display:grid;grid-template-columns:232px minmax(0,1fr);gap:56px}
.toc{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 100px);overflow:auto;padding:36px 0;font-size:14px}
.toc .tieu{color:var(--text);font-weight:600;margin:0 0 4px}
.toc .dem{color:var(--text-3);font-size:13px;margin:0 0 12px}
.toc ol,.toc ul{list-style:none;padding:0;margin:0 0 18px}
.toc li{margin:0}
.toc a{display:flex;gap:8px;padding:5px 10px;margin-left:-10px;color:var(--text-3);text-decoration:none;border-radius:6px;line-height:1.4}
.toc a:hover{color:var(--text);background:var(--bg-3)}
.toc a.on{color:var(--text);background:var(--brand-soft)}
.toc .so{flex:0 0 18px;color:var(--text-3);font-variant-numeric:tabular-nums}
.toc a.xong .so{color:var(--ok)}
main{padding:36px 0 72px;min-width:0}
section{padding:36px 0;border-bottom:1px solid var(--line)}
section:first-child{padding-top:0}
section:last-child{border-bottom:0}
h2{font-size:28px;margin-bottom:14px}
.step h2{font-size:24px;display:flex;gap:14px;align-items:flex-start}
.step .n{flex:0 0 38px;height:38px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:700;margin-top:-3px}
.step-body{padding-left:52px}
h3{font-size:17px;margin:20px 0 8px}

/* ghi chú */
.note{border-left:3px solid var(--line-2);background:var(--bg-2);padding:12px 16px;border-radius:0 8px 8px 0;margin:14px 0;font-size:15px}
.note p:last-child,.note ul:last-child{margin-bottom:0}
.note b.nhan{display:block;margin-bottom:3px}
.note.dung{border-color:var(--ok);background:var(--ok-soft)}
.note.dung b.nhan{color:var(--ok)}
.note.luu{border-color:var(--warn);background:var(--warn-soft)}
.note.luu b.nhan{color:var(--warn)}
.note.lo{border-color:var(--brand);background:var(--brand-soft)}
.note.lo b.nhan{color:var(--brand-2)}

/* ảnh */
figure{margin:18px 0 6px}
.anh{display:block;width:100%;padding:0;border:1px solid var(--line-2);border-radius:10px;overflow:hidden;background:#fff;cursor:zoom-in}
.anh img{width:100%;height:auto}
.anh.hep{max-width:380px}
.anh.vua{max-width:560px}
figcaption{font-size:13.5px;color:var(--text-3);margin-top:8px}
dialog{border:0;padding:0;background:transparent;max-width:96vw;max-height:96vh;overflow:auto}
dialog::backdrop{background:rgba(0,0,0,.88)}
dialog img{max-width:96vw;max-height:none;background:#fff;border-radius:6px}
.dong-anh{position:fixed;top:14px;right:14px}

/* khối code */
.code{border:1px solid var(--line-2);border-radius:10px;overflow:hidden;background:#0a0a0b;margin:14px 0}
.code-dau{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:12px 14px;background:var(--bg-3);border-bottom:1px solid var(--line-2)}
.code-dau .ten{font:400 13.5px var(--mono);color:var(--text);margin-right:auto;overflow-wrap:anywhere}
.code-dau .ten small{display:block;font:400 12.5px Inter,sans-serif;color:var(--text-3)}
.btn.chep{min-width:178px}
.btn.chep.ok{background:#16a34a}
.btn.chep.loi{background:#b91c1c}
pre{margin:0;padding:14px 16px;overflow:auto;max-height:280px;font:400 12.5px/1.6 var(--mono);color:#d4d4d8;tab-size:2}
pre.mo{max-height:70vh}
pre code{background:none;padding:0;font:inherit;color:inherit}
.code-cuoi{padding:8px 14px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13.5px}
.lien{background:none;border:0;padding:0;color:var(--brand-2);font:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
#tb-chep{min-height:1.5em;color:var(--ok);font-size:14.5px;margin:0}
#tb-chep.loi{color:var(--warn)}

/* đánh dấu xong */
.xong-o{display:inline-flex;align-items:center;gap:10px;margin-top:14px;padding:8px 14px 8px 10px;border:1px solid var(--line-2);border-radius:8px;cursor:pointer;color:var(--text);font-size:14.5px;user-select:none}
.xong-o:hover{background:var(--bg-3)}
.xong-o input{width:18px;height:18px;accent-color:var(--brand);margin:0;cursor:pointer}
.xong-o:has(input:checked){border-color:var(--ok);background:var(--ok-soft)}

/* bảng */
.bang{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;vertical-align:top;padding:11px 14px;border-bottom:1px solid var(--line)}
tr:last-child td{border-bottom:0}
th{color:var(--text);font-weight:600;background:var(--bg-3);font-size:14px}
td:first-child{color:var(--text);font-weight:500;white-space:nowrap}
td.tu-do{white-space:normal;min-width:150px}

/* hỏi đáp */
details{border-bottom:1px solid var(--line)}
details:first-of-type{border-top:1px solid var(--line)}
summary{cursor:pointer;padding:14px 28px 14px 0;color:var(--text);font-weight:500;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:4px;top:11px;font-size:21px;color:var(--text-3)}
details[open] summary::after{content:"−"}
details>div{padding:0 0 12px}

.hai{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:14px 0}
.hai>div{border:1px solid var(--line);border-radius:10px;padding:16px 18px;background:var(--bg-2)}
.hai h3{margin-top:0}
.hai>div.nhanh{border-color:var(--brand);background:var(--brand-soft)}
.hai .nhan-goi-y{display:block;color:var(--brand-2);font-size:13.5px;font-weight:600;margin-bottom:4px}
.hai .btn{margin-top:14px}
.hai ul{margin-bottom:0}

/* liên hệ */
.lh{background:var(--bg-2);border:1px solid var(--line);border-radius:14px;padding:28px;margin-top:8px}
.lh .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
footer{border-top:1px solid var(--line);padding:24px;text-align:center;color:var(--text-3);font-size:14px}
footer p{margin:2px 0}

@media (max-width:980px){
  .wrap{grid-template-columns:minmax(0,1fr);gap:0}
  .toc{display:none}
  .facts{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  html{scroll-padding-top:70px}
  .top-in,.hero-in,.wrap{padding-left:16px;padding-right:16px}
  .top nav a.an{display:none}
  .hero-in{padding-top:40px}
  .step-body{padding-left:0;margin-top:12px}
  .hai{grid-template-columns:1fr}
  .facts{grid-template-columns:1fr;gap:12px}
  .yen-tam h2{font-size:21px}
  .btn.chep{width:100%}
  h2{font-size:24px}.step h2{font-size:21px}
  td:first-child{white-space:normal}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.progress i{transition:none}}
@media print{.top,.toc,.xong-o,.btn{display:none}body{background:#fff;color:#222}h1,h2,h3,b,strong{color:#000}pre{max-height:none}}

/* ===== Bổ sung cho site sheets.logidata.vn (build.py nối sau CSS gốc) ===== */

/* header 2 tầng: hàng logo + thanh tab các trang hướng dẫn */
html{scroll-padding-top:118px}
.top-in{padding-top:10px;padding-bottom:10px}
.logo-phu{color:var(--brand-2);font-weight:600;font-size:14px;text-decoration:none;border:1px solid rgba(242,101,34,.45);border-radius:999px;padding:2px 10px;margin-left:-8px;white-space:nowrap}
.logo-phu:hover{background:var(--brand-soft);color:var(--brand-2)}
.top nav .btn{padding:8px 14px}
.top nav.tabs{display:block;margin:0;gap:0;font-size:14px;border-top:1px solid var(--line)}
.tabs-in{max-width:1200px;margin:auto;padding:0 24px;display:flex;gap:4px;align-items:center;overflow-x:auto;scrollbar-width:none}
.tabs-in::-webkit-scrollbar{display:none}
.tabs-in::after{content:"";flex:0 0 16px}
.tabs-nhan{color:var(--text-3);font-size:13px;margin-right:6px;white-space:nowrap}
.tabs a{display:inline-flex;align-items:center;gap:8px;padding:11px 12px;color:var(--text-3);text-decoration:none;font-size:14px;white-space:nowrap;border-bottom:2px solid transparent;margin-bottom:-1px}
.tabs a:hover{color:var(--text)}
.tabs a[aria-current="page"]{color:var(--text);border-bottom-color:var(--brand)}
.tab-so{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;background:var(--bg-3);border:1px solid var(--line-2);font-size:12px;font-weight:600;color:var(--text-2)}
.tabs a[aria-current="page"] .tab-so{background:var(--brand);border-color:var(--brand);color:#fff}
.toc{top:112px;max-height:calc(100vh - 124px)}
.eyebrow a{color:inherit;text-decoration:none;border-bottom:1px dashed rgba(255,125,61,.5)}
.eyebrow a:hover{color:#ffa06f}

/* nút trang trước / sau */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:40px}
.pg{display:flex;flex-direction:column;gap:4px;padding:18px 20px;border:1px solid var(--line-2);border-radius:12px;background:var(--bg-2);color:var(--text);font-weight:600;text-decoration:none;line-height:1.4}
.pg small{color:var(--text-3);font-weight:500;font-size:13px}
.pg:hover{border-color:var(--brand);background:var(--brand-soft);color:var(--text)}
.pg.sau{text-align:right}

/* footer */
footer.chan{border-top:1px solid var(--line);background:var(--bg-2);color:var(--text-3);font-size:14px;text-align:left;padding:0}
.chan-in{max-width:1200px;margin:auto;padding:40px 24px 24px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.chan p{margin:0 0 6px}
.chan .logo{margin-bottom:14px}
.chan-tieu{color:var(--text);font-weight:600;margin-bottom:10px!important}
.chan ul{list-style:none;padding:0;margin:0}
.chan li{margin:0 0 8px}
.chan a{color:var(--text-3);text-decoration:none}
.chan a:hover{color:var(--text)}
.chan-cty a{color:var(--text-2)}
.chan-cuoi{max-width:1200px;margin:auto!important;padding:18px 24px 26px;border-top:1px solid var(--line);font-size:13px;opacity:.75}

/* trang tổng quan */
.trang{max-width:1200px;margin:auto;padding:0 24px 72px}
.trang>section{padding:56px 0}
.muc-dau{max-width:720px;margin-bottom:28px}
.muc-dau p{color:var(--text-3)}
.lo-trinh{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;list-style:none;padding:0;margin:0;counter-reset:b}
.lo-trinh li{margin:0}
.the{position:relative;display:flex;flex-direction:column;height:100%;padding:24px 22px 22px;border:1px solid var(--line-2);border-radius:14px;background:var(--bg-2);color:var(--text-2);text-decoration:none;transition:border-color .15s,transform .15s}
.the:hover{border-color:var(--brand);transform:translateY(-2px);color:var(--text-2)}
.the .so-lon{width:40px;height:40px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;margin-bottom:16px}
.the h3{font-size:20px;margin:0 0 8px}
.the p{flex:1;margin-bottom:14px}
.the .meta{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:16px}
.the .meta span{border:1px solid var(--line-2);border-radius:999px;padding:2px 10px}
.the .di{color:var(--brand-2);font-weight:600}
.lo-trinh li:not(:last-child) .the::after{content:"→";position:absolute;right:-16px;top:50%;transform:translateY(-50%);color:var(--line-2);font-size:20px;z-index:1}
.luoi-tab{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.o-tab{padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--bg-2)}
.o-tab code{font-size:13px;color:var(--brand-2);background:var(--brand-soft)}
.o-tab p{margin:8px 0 0;font-size:15px}
.dich-vu{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dich-vu a{display:block;padding:22px;border:1px solid var(--line-2);border-radius:12px;background:var(--bg-2);color:var(--text-2);text-decoration:none}
.dich-vu a:hover{border-color:var(--brand)}
.dich-vu b{display:block;font-size:17px;margin-bottom:6px}
.dich-vu .di{display:block;margin-top:10px;color:var(--brand-2);font-weight:600;font-size:14px}
.trang-404{max-width:640px;margin:auto;padding:96px 24px;text-align:center}
.trang-404 .cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:20px}

@media (max-width:980px){
  .chan-in{grid-template-columns:1fr 1fr}
  .lo-trinh,.luoi-tab,.dich-vu{grid-template-columns:1fr 1fr}
  .lo-trinh li .the::after{display:none}
}
@media (max-width:640px){
  html{scroll-padding-top:108px}
  .tabs-in{padding:0 12px}
  .top nav{gap:10px}
  .top nav a.an-sm{display:none}
  .pager{grid-template-columns:1fr}
  .pg.sau{text-align:left}
  .chan-in{grid-template-columns:1fr;gap:24px;padding:32px 16px 16px}
  .chan-cuoi{padding:16px}
  .trang{padding:0 16px 56px}
  .trang>section{padding:40px 0}
  .lo-trinh,.luoi-tab,.dich-vu{grid-template-columns:1fr}
}
@media print{.tabs,.pager,.chan{display:none}}