:root{
  --ink:#0F2A47; --ink-deep:#0A1D33; --ink-mid:#16457A;
  --amber:#EF9F27; --amber-deep:#BA7517; --amber-soft:#FDF2DF;
  --teal:#1D9E75; --teal-soft:#E4F4EE; --teal-deep:#0F6E56;
  --sand:#F6F4EF; --paper:#FFFFFF;
  --line:#E4E1D9; --line-soft:#EFEDE7;
  --tx:#152234; --tx-2:#5C6877; --tx-3:#8B94A0;
  --r:10px; --r-lg:16px; --wrap:1280px; --gut:24px;
  --grad-ink:linear-gradient(135deg,#08182A 0%,#123A5F 52%,#1B5680 100%);
  --grad-ink-soft:linear-gradient(140deg,#0F2A47 0%,#16456F 100%);
  --grad-amber:linear-gradient(135deg,#F8B443 0%,#EF9F27 48%,#DB8214 100%);
  --grad-amber-hov:linear-gradient(135deg,#FCC259 0%,#F4A833 48%,#E4901D 100%);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:100px;-webkit-text-size-adjust:100%}
body{font-family:'Plus Jakarta Sans',system-ui,sans-serif;background:var(--paper);color:var(--tx);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit;text-align:left}
:focus-visible{outline:2.5px solid var(--amber);outline-offset:3px;border-radius:4px}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.skip{position:absolute;left:-9999px;background:var(--ink);color:#fff;padding:12px 20px;z-index:200}
.skip:focus{left:0;top:0}
h1,h2,h3{line-height:1.22;letter-spacing:-.026em;font-weight:600}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:13px 24px;border-radius:var(--r);font-weight:600;font-size:.94rem;transition:transform .15s,background .2s,border-color .2s}
.btn:active{transform:translateY(1px)}
.btn-ink{background:var(--grad-ink-soft);color:#fff}.btn-ink:hover{background:linear-gradient(140deg,#16456F 0%,#1D5B8C 100%)}
.btn-line{border:1.5px solid var(--line);color:var(--tx);background:var(--paper)}
.btn-line:hover{border-color:var(--ink);background:var(--sand)}
.btn-sm{padding:10px 17px;font-size:.87rem}

.hdr{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft)}
.hdr .wrap{display:flex;align-items:center;gap:18px;height:78px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:1.3rem;letter-spacing:-.04em;color:var(--ink);flex:none}
.logo-mark{width:35px;height:35px;border-radius:9px;background:var(--grad-ink-soft);display:grid;place-items:center;position:relative;overflow:hidden;flex:none}
.logo-mark::after{content:"";position:absolute;inset:auto 0 0 0;height:11px;background:var(--grad-amber)}
.logo-mark span{color:#fff;font-size:1.02rem;font-weight:700;z-index:1;letter-spacing:-.05em;line-height:1}
.logo em{font-style:normal;font-weight:400;color:var(--tx-2);font-size:1rem}
.nav{display:flex;align-items:center;gap:6px;margin:0 auto}
.nav a{padding:10px 15px;border-radius:8px;font-size:.96rem;font-weight:500;white-space:nowrap}
.nav a:hover{background:var(--sand)}
.hdr-actions{display:flex;align-items:center;gap:8px;flex:none}
.burger{display:none}
@media(max-width:1080px){.nav{display:none}.burger{display:grid;place-items:center;width:40px;height:40px;border-radius:9px}}

.top{background:var(--sand);border-bottom:1px solid var(--line);padding:46px 0 42px}
.top .eyebrow{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--amber-deep);display:flex;align-items:center;gap:10px;margin-bottom:13px}
.top .eyebrow::before{content:"";width:22px;height:2px;background:var(--grad-amber)}
.top h1{font-size:clamp(1.7rem,3.2vw,2.35rem);letter-spacing:-.034em}
.top p{color:var(--tx-2);margin-top:12px;max-width:64ch;line-height:1.72}

.app{display:grid;grid-template-columns:272px minmax(0,1fr);gap:44px;padding:38px 0 84px;align-items:start}
@media(max-width:960px){.app{grid-template-columns:1fr;gap:24px}}

/* ===== cột trái ===== */
.rail{position:sticky;top:96px}
@media(max-width:960px){.rail{position:static}}
.rail h2{font-size:.68rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--tx-3);margin-bottom:12px}
.docnav{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:8px;margin-bottom:18px}
.docnav button{display:flex;align-items:flex-start;gap:11px;width:100%;padding:12px 13px;border-radius:9px;font-size:.92rem;font-weight:500;color:var(--tx-2);line-height:1.45}
.docnav button svg{flex:none;margin-top:3px;color:var(--tx-3)}
.docnav button:hover{background:var(--sand);color:var(--tx)}
.docnav button[aria-selected="true"]{background:var(--grad-ink-soft);color:#fff;font-weight:600}
.docnav button[aria-selected="true"] svg{color:var(--amber)}
.railbox{background:var(--sand);border:1px solid var(--line);border-radius:14px;padding:18px}
.railbox b{display:block;font-size:.9rem;font-weight:600;margin-bottom:6px}
.railbox p{font-size:.83rem;color:var(--tx-2);line-height:1.62}
.railbox .btn{margin-top:13px;width:100%}

/* ===== nội dung ===== */
.doc[hidden]{display:none}
.dochd{padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:26px}
.dochd h2{font-size:clamp(1.4rem,2.6vw,1.9rem);letter-spacing:-.032em}
.dochd .meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px;font-size:.85rem;color:var(--tx-3)}
.dochd .meta b{color:var(--tx-2);font-weight:600}

.toc{background:var(--sand);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin-bottom:32px}
.toc h3{font-size:.68rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--tx-3);margin-bottom:12px}
.toc ol{list-style:none;counter-reset:t;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:7px 22px}
.toc li{counter-increment:t}
.toc a{display:flex;gap:10px;font-size:.9rem;color:var(--tx-2);line-height:1.5;padding:3px 0}
.toc a::before{content:counter(t) "."; color:var(--amber-deep);font-weight:700;font-variant-numeric:tabular-nums;flex:none}
.toc a:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

.doc section{margin-bottom:34px;scroll-margin-top:100px}
.doc section h3{font-size:1.16rem;margin-bottom:13px;display:flex;gap:11px;align-items:baseline}
.doc section h3 .no{font-size:.86rem;font-weight:700;color:var(--amber-deep);font-variant-numeric:tabular-nums;flex:none}
.doc p{font-size:.98rem;color:var(--tx-2);line-height:1.78}
.doc p+p{margin-top:12px}
.doc ul{list-style:none;display:flex;flex-direction:column;gap:9px;margin:13px 0}
.doc ul li{display:flex;gap:11px;align-items:flex-start;font-size:.96rem;color:var(--tx-2);line-height:1.72}
.doc ul li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--amber);flex:none;margin-top:11px}
.doc ul li b,.doc p b{color:var(--tx);font-weight:600}
.doc .sub{margin-left:22px}

.note{background:var(--amber-soft);border:1px solid #F3DFB6;border-radius:13px;padding:18px 20px;margin:20px 0}
.note b{display:flex;align-items:center;gap:9px;font-size:.94rem;font-weight:600;margin-bottom:7px;color:#5C4416}
.note b svg{flex:none;color:var(--amber-deep)}
.note p{font-size:.93rem;color:#6B5322;line-height:1.72;margin:0}

.tbl{border:1px solid var(--line);border-radius:13px;overflow-x:auto;margin:20px 0}
table{width:100%;border-collapse:collapse;font-size:.93rem;min-width:460px}
thead th{background:var(--sand);text-align:left;font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--tx-2);padding:12px 15px;border-bottom:1px solid var(--line)}
tbody td{padding:13px 15px;border-bottom:1px solid var(--line-soft);vertical-align:top;color:var(--tx-2)}
tbody tr:last-child td{border-bottom:none}
tbody td:first-child{font-weight:600;color:var(--tx);white-space:nowrap}

.contact{background:var(--grad-ink);color:#fff;border-radius:16px;padding:26px 28px;margin-top:36px}
.contact b{display:block;font-size:1.05rem;font-weight:600;margin-bottom:8px}
.contact p{color:#BFCEDE;font-size:.94rem;line-height:1.72;margin:0}
.contact .rows{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:18px}
.contact .rw{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:11px;padding:14px 16px}
.contact .rw small{display:block;font-size:.76rem;color:#8FA2B7;margin-bottom:3px}
.contact .rw span{font-size:.95rem;font-weight:600}

.ft{background:linear-gradient(180deg,#0A1D33 0%,#0C2440 100%);color:#B7C5D5;font-size:.89rem;padding:52px 0 0}
.ft-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
.ft .logo{color:#fff;margin-bottom:15px}.ft .logo em{color:#8FA2B7}
.ft-about{line-height:1.75;max-width:38ch}
.ft h4{color:#fff;font-size:.9rem;font-weight:600;margin-bottom:13px}
.ft ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.ft a:hover{color:var(--amber)}
.ft-legal{border-top:1px solid rgba(255,255,255,.11);padding:24px 0 40px;font-size:.8rem;line-height:1.8;color:#8FA2B7}
.ft-legal .moit{display:inline-flex;align-items:center;gap:8px;margin-top:14px;padding:7px 12px;border:1px solid rgba(255,255,255,.18);border-radius:6px;font-size:.75rem}
@media(max-width:860px){.ft-top{grid-template-columns:1fr 1fr;gap:28px}}
@media(max-width:520px){.ft-top{grid-template-columns:1fr}}

@media print{
  .hdr,.rail,.ft,.top,.contact,.skip{display:none!important}
  .app{grid-template-columns:1fr;padding:0}
  .doc[hidden]{display:block!important;page-break-before:always}
  body{font-size:11pt}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}