/* SIPTech - giao diện doanh nghiệp: sáng, bo mềm, xanh dương làm màu chính */
:root{
  --brand:#1d4ed8;--brand-d:#1239a8;--navy:#0b1f4d;--accent:#ff7a3d;
  --bg:#fff;--tint:#f4f7fd;--line:#e3e8f2;--line2:#cfd7e6;
  --text:#14213d;--mute:#56627d;--brand-soft:#e8efff;--ok:#0f9d6b;
  --warn-bg:#fff6ec;--warn:#b45309;
  --r:16px;--r-s:10px;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;
  --shadow:0 1px 2px rgba(11,31,77,.05),0 10px 30px -12px rgba(11,31,77,.18);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;overflow-x:hidden;color-scheme:light}
body{margin:0;background:var(--bg);color:var(--text);font:16.5px/1.7 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{font-weight:700;letter-spacing:-.015em;line-height:1.28;margin:0 0 .5em;color:var(--navy)}
h1,h2,h3{text-wrap:balance}
a{color:var(--brand)}
::selection{background:var(--brand-soft)}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.narrow{max-width:860px}
.skip{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:8px;top:8px}
:focus-visible{outline:3px solid #93b4ff;outline-offset:2px;border-radius:6px}
.ic{flex:none;vertical-align:middle}

/* header */
.top{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy);font:800 21px var(--sans);letter-spacing:-.02em}
.brand b{color:var(--brand);font-weight:800}
.brand .logo{width:34px;height:34px}
.brand.sm{font-size:19px}.brand.sm .logo{width:30px;height:30px}
#nav{display:flex;align-items:center;gap:4px}
#nav a{color:var(--text);text-decoration:none;padding:9px 14px;border-radius:99px;font-size:15px;font-weight:500}
#nav a:hover{background:var(--tint)}
#nav a.cta{background:var(--brand);color:#fff;margin-left:8px;font-weight:600}
#nav a.cta:hover{background:var(--brand-d)}
.menu{display:none;background:#fff;border:1px solid var(--line2);border-radius:99px;color:var(--text);font:600 14px var(--sans);padding:8px 16px;cursor:pointer}

/* hero */
.hero{background:linear-gradient(180deg,#eef3ff 0%,#fff 100%);padding-top:64px}
.herogrid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;padding-bottom:56px}
.herogrid>*{min-width:0}
.pill{display:inline-block;background:var(--brand-soft);color:var(--brand-d);font:600 13.5px var(--sans);padding:6px 14px;border-radius:99px;margin-bottom:20px}
.hero h1,.ghero h1{font-size:clamp(32px,4.6vw,52px);font-weight:800;letter-spacing:-.03em;line-height:1.14;margin-bottom:20px}
.hl{color:var(--brand)}
.lead{font-size:18px;color:var(--mute);max-width:620px;margin:0}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0 0}
.btns.c{justify-content:center}
.btn{display:inline-block;padding:14px 26px;font:600 15.5px var(--sans);text-decoration:none;border-radius:99px;border:1.5px solid transparent;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn.pri{background:var(--brand);color:#fff;box-shadow:0 8px 20px -8px rgba(29,78,216,.6)}
.btn.pri:hover{background:var(--brand-d)}
.btn.ghost{border-color:var(--line2);color:var(--navy);background:#fff}
.btn.ghost:hover{border-color:var(--brand)}
.btn.pri.light{background:#fff;color:var(--brand-d);box-shadow:none}
.btn.ghost.light{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.checks{list-style:none;padding:0;margin:26px 0 0;display:flex;flex-wrap:wrap;gap:8px 22px;color:var(--mute);font-size:14.5px}
.checks li{display:flex;align-items:center;gap:6px}.checks .ic{color:var(--ok)}

.flowcard{background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:22px}
.fhead{display:flex;align-items:center;gap:10px;font:600 13.5px var(--sans);color:var(--mute);padding-bottom:16px;border-bottom:1px solid var(--line)}
.fhead .dot{width:9px;height:9px;border-radius:50%;background:var(--ok)}
.flowcard ol{list-style:none;margin:0;padding:18px 0 0;position:relative}
.flowcard li{display:grid;grid-template-columns:44px 1fr auto;gap:14px;align-items:center;padding:12px;border-radius:14px;position:relative}
.flowcard li+li{margin-top:6px}
.flowcard li:not(:last-child)::after{content:"";position:absolute;left:33px;top:56px;width:2px;height:12px;background:var(--line2)}
.fi{width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center}
.flowcard b{display:block;font-size:15px;line-height:1.35;color:var(--navy)}
.flowcard small{display:block;color:var(--mute);font-size:13px;line-height:1.4;margin-top:2px}
.flowcard em{font:600 12px var(--sans);font-style:normal;background:var(--tint);color:var(--mute);padding:4px 10px;border-radius:99px}
.flowcard li.hot{background:var(--warn-bg)}
.flowcard li.hot .fi{background:#ffe3cf;color:#d9531a}
.flowcard li.hot em{background:var(--accent);color:#fff}

.facts{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);margin-bottom:-1px;transform:translateY(32px)}
.facts>div{padding:20px 24px;border-right:1px solid var(--line)}
.facts>div:last-child{border-right:0}
.facts b{display:block;font:800 30px var(--sans);color:var(--brand);letter-spacing:-.03em;line-height:1.1}
.facts span{color:var(--mute);font-size:14px;line-height:1.4;display:block;margin-top:4px}

/* sections */
.sec{padding:88px 0 0}
.sec.tint{background:var(--tint);padding:80px 0;margin-top:88px}
.hero+.sec{padding-top:112px}
.sec:last-of-type{padding-bottom:88px}
.sh{margin-bottom:34px;max-width:760px}
.eyebrow{display:block;font:700 13px var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:10px}
.sh h2{font-size:clamp(26px,3.2vw,36px);font-weight:800;letter-spacing:-.025em;margin:0}
.sh .sub{margin:12px 0 0;color:var(--mute);font-size:17px}
.sh.light h2{color:#fff}.sh.light .eyebrow{color:#9db8ff}.sh.light .sub{color:#b9c6e6}.sh.light a{color:#fff}
.fine{color:var(--mute);font-size:14.5px;margin-top:20px}
.subh{font-size:19px;margin:48px 0 18px}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.issue{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.issue h3{font-size:20px}.issue p{margin:0;color:var(--mute);font-size:15.5px}
.pico{width:52px;height:52px;border-radius:14px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;margin-bottom:18px}
.pico.sm{width:42px;height:42px;border-radius:12px;margin:0}
.pico.big{width:60px;height:60px;border-radius:16px;margin:0}

.band{background:var(--navy);color:#fff;padding:80px 0;margin-top:88px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--r);padding:26px}
.stat b{display:block;font:800 44px/1 var(--sans);letter-spacing:-.04em;color:#fff;margin-bottom:14px}
.stat p{margin:0 0 14px;font-size:15px;line-height:1.55;color:#d6def2}
.stat small{color:#9db0d9;font-size:12.5px}

.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pcard{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;text-decoration:none;color:inherit;transition:transform .18s,box-shadow .18s,border-color .18s}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b8caf5}
.pmeta{font:600 13px var(--sans);color:var(--mute);margin-bottom:6px}
.pcard h3{font-size:21px;margin-bottom:6px}
.ptag{color:var(--brand);font-weight:600;font-size:15px;margin:0 0 10px}
.pcard p{color:var(--mute);font-size:15.5px;margin:0}
.pout{display:flex;gap:8px;align-items:flex-start;margin:18px 0 20px;padding:12px 14px;background:var(--tint);border-radius:12px;font-size:14.5px;color:var(--text);line-height:1.45}
.pout .ic{color:var(--ok);margin-top:1px}
.go{margin-top:auto;display:inline-flex;align-items:center;gap:6px;font:600 15px var(--sans);color:var(--brand)}
.pcard:hover .go .ic{transform:translateX(3px)}.go .ic{transition:transform .15s}
.ctacard{background:var(--brand);border-color:var(--brand);justify-content:center}
.ctacard h3,.ctacard p,.ctacard .go{color:#fff}.ctacard p{opacity:.9;margin-bottom:22px}
.ctacard:hover{border-color:var(--brand-d);background:var(--brand-d)}

.prs{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.pr{display:grid;grid-template-columns:42px 1fr;gap:16px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.pr h3{font-size:18px;margin-bottom:6px}.pr p{margin:0;color:var(--mute);font-size:15px}
.order{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.order li{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;position:relative}
.order li:not(:last-child)::after{content:"";position:absolute;top:36px;right:-17px;width:18px;height:2px;background:var(--line2);z-index:1}
.sn{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font:700 14px var(--sans);margin-bottom:12px}
.order b{display:block;color:var(--navy);margin-bottom:4px}.order li span:last-child{color:var(--mute);font-size:14px;line-height:1.5;display:block}

.bases{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.base{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;text-decoration:none;color:inherit;transition:transform .18s,box-shadow .18s,border-color .18s}
.base:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#b8caf5}
.base h3{font-size:18px}.base p{margin:0 0 18px;color:var(--mute);font-size:14.5px}

.limits{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.limits li{display:grid;grid-template-columns:40px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.lic{width:40px;height:40px;border-radius:12px;background:var(--warn-bg);color:var(--warn);display:grid;place-items:center}
.limits div{color:var(--mute);font-size:15.5px}.limits b{color:var(--navy)}

.cta{background:var(--brand);color:#fff;text-align:center;padding:80px 0}
.cta h2{color:#fff;font-size:clamp(26px,3.4vw,38px);font-weight:800;letter-spacing:-.025em;max-width:760px;margin:0 auto 12px}
.cta p{color:#d3e0ff;margin:0;font-size:17px}

/* footer */
.foot{background:var(--navy);color:#b9c6e6;padding:52px 0 32px;font-size:15px}
.fcols{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:32px}
.foot h4{color:#fff;font:700 14px var(--sans);margin-bottom:12px}
.foot a{display:block;color:#b9c6e6;text-decoration:none;padding:3px 0}
.foot a:hover{color:#fff}
.foot .brand{color:#fff}.foot .brand b{color:#8fb0ff}.foot p{margin:10px 0 0}
.legal{margin-top:32px!important;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);font-size:13.5px;line-height:1.65;color:#9db0d9}

/* group page */
.ghero{background:linear-gradient(180deg,#eef3ff 0%,#fff 100%);padding:34px 0 40px}
.crumb{font-size:14px;color:var(--mute);margin-bottom:22px}
.crumb a{color:inherit;text-decoration:none}.crumb a:hover{color:var(--brand)}.crumb i{font-style:normal;margin:0 4px;opacity:.5}
.gtop{display:flex;align-items:center;gap:14px;margin-bottom:18px}.gtop .pill{margin:0}
.outline{display:flex;gap:8px;align-items:flex-start;margin:22px 0 0;color:var(--text)}
.outline .ic{color:var(--ok);margin-top:4px}
.dl{margin-top:24px;display:inline-block}
.lvh{font-size:24px;font-weight:800;margin:44px 0 18px}
.lvs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.lv{display:grid;grid-template-columns:40px 1fr 22px;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 18px;color:var(--text);text-decoration:none;transition:border-color .15s,box-shadow .15s,transform .15s}
.lv:hover{border-color:#b8caf5;box-shadow:var(--shadow);transform:translateY(-2px)}
.lv .n{width:40px;height:40px;border-radius:12px;background:var(--brand-soft);color:var(--brand-d);display:grid;place-items:center;font:700 16px var(--sans)}
.lv .t{font-size:15.5px;line-height:1.4;font-weight:500}
.lv .a{color:var(--mute)}.lv:hover .a{color:var(--brand)}

/* doc */
.docgrid{display:grid;grid-template-columns:260px minmax(0,1fr) 210px;gap:40px;padding-top:32px;padding-bottom:72px;align-items:start}
.side,.otp{position:sticky;top:88px;max-height:calc(100vh - 104px);overflow:auto;font-size:14.5px}
.side a{display:block;padding:8px 14px;color:var(--mute);text-decoration:none;line-height:1.4;border-radius:10px;margin-bottom:2px}
.side a:hover{background:var(--tint);color:var(--text)}
.side a.cur{background:var(--brand-soft);color:var(--brand-d);font-weight:600}
.otp h4{font:700 12px var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--mute)}
.otp a{display:block;padding:5px 0 5px 14px;color:var(--mute);text-decoration:none;border-left:2px solid var(--line);font-size:13.5px;line-height:1.45}
.otp a:hover{color:var(--brand);border-left-color:var(--brand)}
.doc{min-width:0}
.doc>h1{font-size:clamp(28px,3.4vw,38px);font-weight:800;letter-spacing:-.025em;margin-bottom:.7em}
.doc h2{font-size:25px;margin-top:2.1em;font-weight:800}
.doc h3{font-size:20px;margin-top:1.7em}
.doc h4{font-size:17px;margin-top:1.4em}
.doc p,.doc li{max-width:78ch}
.doc blockquote{margin:1.3em 0;padding:.8em 1.2em;border-radius:14px;background:var(--brand-soft);color:var(--navy)}
.doc blockquote p{margin:.4em 0}
.doc code{background:var(--tint);border:1px solid var(--line);padding:.08em .38em;font:0.88em var(--mono);word-break:break-word;border-radius:6px}
.doc pre{background:#0f1b3d;color:#e4eaff;padding:18px 20px;overflow:auto;font-size:13.5px;line-height:1.6;border-radius:14px}
.doc pre code{background:none;border:0;padding:0;color:inherit;word-break:normal}
.tw{overflow-x:auto;margin:1.3em 0;border:1px solid var(--line);border-radius:14px}
.doc table{border-collapse:collapse;width:100%;font-size:15px}
.doc th{background:var(--tint);text-align:left;font-weight:700;color:var(--navy)}
.doc th,.doc td{padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.doc tr:last-child td{border-bottom:0}
.doc hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.doc.inline{padding-bottom:72px}
.doc.inline h2:first-of-type{margin-top:1em}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:56px}
.pn a{display:block;padding:16px 20px;text-decoration:none;color:var(--navy);background:#fff;border:1px solid var(--line);border-radius:14px;line-height:1.4;font-weight:600}
.pn a:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.pn small{display:block;color:var(--brand);font-size:12.5px;font-weight:600;margin-bottom:4px}
.pn .next{text-align:right}

@media (max-width:1060px){
  .docgrid{grid-template-columns:240px minmax(0,1fr)}.otp{display:none}
  .pgrid,.grid3{grid-template-columns:repeat(2,1fr)}
  .bases,.stats{grid-template-columns:repeat(2,1fr)}
  .order{grid-template-columns:repeat(2,1fr)}.order li:nth-child(2)::after{display:none}
}
@media (max-width:820px){
  body{font-size:16px}
  .menu{display:block}
  #nav{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;background:#fff;border-bottom:1px solid var(--line);padding:8px 24px 18px;gap:0}
  #nav.open{display:flex}
  #nav a{padding:13px 4px;border-radius:0;border-bottom:1px solid var(--line)}
  #nav a.cta{margin:14px 0 0;text-align:center;border:0;border-radius:99px}
  .herogrid{grid-template-columns:1fr;gap:36px}.hero{padding-top:40px}
  .facts{grid-template-columns:1fr 1fr;transform:translateY(24px)}
  .facts>div:nth-child(2){border-right:0}.facts>div:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .sec{padding-top:64px}.hero+.sec{padding-top:88px}
  .sec.tint,.band{padding:60px 0;margin-top:64px}
  .grid3,.pgrid,.prs,.lvs,.fcols{grid-template-columns:1fr}
  .docgrid{grid-template-columns:1fr;gap:12px}
  .side{position:static;max-height:none;border:1px solid var(--line);border-radius:14px;padding:6px}
  .side .sidein{max-height:190px;overflow:auto}
}
@media (max-width:520px){.stats,.bases,.order{grid-template-columns:1fr}.order li::after{display:none!important}.pn{grid-template-columns:1fr}.flowcard li{grid-template-columns:44px 1fr}.flowcard em{display:none}.flowcard li::after{display:none}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.top,.foot,.side,.otp,.pn{display:none}.docgrid{display:block}}

/* trang bộ nhận diện */
.bgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.bt{margin:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;display:flex;flex-direction:column}
.bi{display:grid;place-items:center;padding:34px 20px;min-height:170px;background:#fff}
.bi img{max-width:100%;display:block}
.bt.dk .bi{background:var(--navy)}.bt.bl .bi{background:var(--brand)}
.bt figcaption{border-top:1px solid var(--line);padding:12px 16px;font-size:14px;color:var(--mute);display:flex;flex-wrap:wrap;gap:2px 10px;align-items:baseline;justify-content:space-between}
.bt figcaption b{color:var(--navy);font-weight:600}
.bt figcaption small{flex-basis:100%;font-size:12.5px}
.bt figcaption span{font-weight:600}
.swgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(360px,1fr));gap:16px}
.sw2{margin:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff}
.sw2 img{display:block;width:100%;height:auto}
.sw2 figcaption{padding:12px 16px;font-size:14px;color:var(--mute);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.sw2 figcaption b{color:var(--navy);font-weight:600}.sw2 figcaption span{font-weight:600}
.cwgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin-bottom:28px}
.cw{border-radius:14px;padding:18px;min-height:110px;display:flex;flex-direction:column;justify-content:flex-end;font-size:13.5px}
.cw b{font-size:16px}
.rules{padding-left:20px;margin:0;max-width:760px}.rules li{margin-bottom:8px}
.cta{position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;right:-30px;top:50%;width:420px;height:420px;transform:translateY(-50%);opacity:.09;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 64'%3E%3Cpath d='M44 20C44 12 33 11 27 14C20 18 21 26 30 30C39 34 44 38 41 45C38 52 27 52 20 46' fill='none' stroke='white' stroke-width='5.5' stroke-linecap='round'/%3E%3C/svg%3E") center/contain no-repeat;pointer-events:none}
.cta>*{position:relative}
@media (max-width:820px){.cta::before{width:260px;height:260px;right:-60px}}

/* danh sách bài toán động */
.phead{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:6px}
.phead .pico{margin-bottom:12px}
.badge{font:600 12px var(--sans);padding:4px 10px;border-radius:99px;white-space:nowrap}
.b-published{background:#e3f6ee;color:#0b7a53}
.b-draft{background:#fff1dc;color:#a14b00}
.b-planned{background:var(--tint);color:var(--mute);border:1px dashed var(--line2)}
.upd{display:block;font-size:12.5px;color:var(--mute);margin:-8px 0 16px}
.upd2{font-size:13px;color:var(--mute)}
.go.soon{color:var(--mute);font-weight:500;font-size:14px}
.pcard.st-planned{background:var(--tint);border-style:dashed;cursor:default}
.pcard.st-planned:hover{transform:none;box-shadow:none;border-color:var(--line2)}
.pcard[hidden]{display:none}
.allp{margin:28px 0 0}
.allp .btn{display:inline-flex;align-items:center;gap:8px}
.tools{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-bottom:14px}
.srch{flex:1 1 320px;display:flex;align-items:center;gap:10px;background:#fff;border:1.5px solid var(--line2);border-radius:99px;padding:0 18px;color:var(--mute)}
.srch:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.srch input{flex:1;border:0;outline:0;background:none;font:500 15.5px var(--sans);color:var(--text);padding:13px 0;min-width:0}
.chips2{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1.5px solid var(--line2);background:#fff;color:var(--text);font:600 14px var(--sans);border-radius:99px;padding:9px 16px;cursor:pointer}
.chip b{font-weight:600;color:var(--mute);margin-left:4px}
.chip:hover{border-color:var(--brand)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}.chip.on b{color:#cfe0ff}
.count{color:var(--mute);font-size:14px;margin:0 0 18px}
.empty{padding:36px;text-align:center;color:var(--mute);background:var(--tint);border-radius:var(--r)}
.order{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))!important}

.ghero+.sec{padding-top:44px}

/* ===== bài viết dạng blog ===== */
.byline{display:flex;flex-wrap:wrap;gap:4px 16px;color:var(--mute);font-size:14px;margin:-4px 0 22px}
.byline span+span::before{content:"·";margin-right:16px;opacity:.6}
.doc.blog>.byline+p{font-size:19.5px;line-height:1.7;color:#33415f;max-width:68ch}
.doc.blog h2{margin-top:2.4em}
.doc.blog p,.doc.blog li{max-width:72ch}
.doc.blog li{margin-bottom:.35em}
.cite{display:inline-block;font:600 11.5px/1.5 var(--sans);padding:0 8px;margin:0 1px;border-radius:99px;background:var(--brand-soft);color:var(--brand-d)!important;text-decoration:none;white-space:nowrap;vertical-align:1px;border:1px solid transparent}
.cite:hover{background:var(--brand);color:#fff!important}
.vb{display:inline-block;font:600 11.5px/1.5 var(--sans);padding:0 8px;border-radius:99px;white-space:nowrap;vertical-align:1px}
.vb-ok,.vb-chi{background:#e3f6ee;color:#0b7a53}
.vb-part,.vb-cmid{background:#fff1dc;color:#a14b00}
.vb-no,.vb-clow{background:#fde8e6;color:#b42318}
.admonition{border-radius:14px;padding:14px 18px;margin:1.5em 0;background:var(--tint);border:1px solid var(--line);max-width:72ch}
.admonition p{margin:.4em 0}.admonition-title{font-weight:700;margin:0 0 4px!important;color:var(--navy)}
.admonition.warning{background:var(--warn-bg);border-color:#ffd9b0}.admonition.warning .admonition-title{color:#a14b00}
.admonition.proposal{background:var(--brand-soft);border-color:#c9d9ff}.admonition.proposal .admonition-title{color:var(--brand-d)}
.admonition.verify{background:#fff;border-style:dashed;border-color:var(--line2)}
.doc table{font-size:14px}
.doc th,.doc td{padding:8px 12px}
.doc.blog td:first-child{font-weight:600;color:var(--navy)}
.doc table.stack.nolead td:first-child{font-weight:inherit;color:inherit}
.srcs{list-style:none;padding:0;margin:1.2em 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-width:none}
.src{display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;margin:0!important;max-width:none!important;scroll-margin-top:90px}
.src:target{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.sid{font:700 13px var(--sans);color:var(--brand-d);background:var(--brand-soft);border-radius:9px;height:30px;display:grid;place-items:center}
.src b{display:block;font-size:14.5px;line-height:1.4;color:var(--navy)}
.src small{display:block;color:var(--mute);font-size:12.5px;line-height:1.4;margin-top:2px}
.srow{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin-top:8px}
.lvl{font:600 11px var(--sans);font-style:normal;padding:1px 8px;border-radius:99px}
.lvl-ok{background:#e3f6ee;color:#0b7a53}.lvl-mid{background:#fff1dc;color:#a14b00}.lvl-low{background:#fde8e6;color:#b42318}
.slinks a{font:600 13px var(--sans);margin-right:10px}.nolink{font-size:12.5px;color:var(--mute)}
.sn2{margin:6px 0 0;font-size:13px;color:var(--mute);line-height:1.5}
@media (max-width:820px){.srcs{grid-template-columns:1fr}}
@media (max-width:720px){
  .doc table.stack thead{display:none}
  .doc table.stack,.doc table.stack tbody,.doc table.stack tr,.doc table.stack td{display:block;width:100%}
  .doc table.stack tr{padding:10px 4px;border-bottom:1px solid var(--line2)}
  .doc table.stack td{border:0;padding:3px 12px}
  .doc table.stack td::before{content:attr(data-label);display:block;font:600 11.5px var(--sans);letter-spacing:.04em;text-transform:uppercase;color:var(--mute)}
  .doc table.stack td:first-child::before{display:none}
}

.doc.blog td:first-child{min-width:150px}
.doc table td .vb{margin-top:2px}

.docgrid.wide{max-width:1400px;grid-template-columns:230px minmax(0,1fr) 190px;gap:36px}
@media (max-width:1060px){.docgrid.wide{grid-template-columns:220px minmax(0,1fr)}}
@media (max-width:820px){.docgrid.wide{grid-template-columns:1fr}}

/* ===== bài giảng ===== */
.tg{display:inline-block;font:600 11px/1.55 var(--sans);padding:0 8px;margin:0 2px;border-radius:99px;white-space:nowrap;vertical-align:1px;cursor:help;border:1px solid transparent}
.tg-src{background:#e3f6ee;color:#0b7a53}
.tg-prop{background:var(--brand-soft);color:var(--brand-d)}
.tg-ill{background:#f2f3f7;color:#56627d;border:1px dashed #b7bfd1}
.tg-obs{background:#fff1dc;color:#a14b00}
.tg-run{background:#e3f6ee;color:#0b7a53}.tg-norun{background:#fff1dc;color:#a14b00}
.tg-calc{background:#eef0ff;color:#3b3fb5}.tg-op{background:#fff1dc;color:#a14b00}.tg-prin{background:#e3f6ee;color:#0b7a53}
.tg-note{background:transparent;color:var(--mute);font-weight:500;cursor:default}
.cite.nolink{cursor:default;opacity:.8}.cite.nolink:hover{background:var(--brand-soft);color:var(--brand-d)!important}
.legend{font-size:13.5px;color:var(--mute);background:var(--tint);border-radius:12px;padding:10px 14px;margin:0 0 20px;max-width:72ch;line-height:1.9}
.gl{border-bottom:1.5px dotted var(--brand);color:inherit;text-decoration:none;cursor:help}
.gl:hover{background:var(--brand-soft)}
.byline a{color:inherit;text-decoration:none;border-bottom:1px solid var(--line2)}.byline a:hover{color:var(--brand)}
.authnote{margin:2.4em 0 1em;border:1.5px dashed var(--line2);border-radius:14px;padding:4px 18px;background:#fff}
.authnote summary{cursor:pointer;padding:12px 0;color:var(--mute);font-size:14.5px;list-style:revert}
.authnote summary b{color:var(--navy)}
.authnote[open] summary{border-bottom:1px solid var(--line);margin-bottom:8px}
.doc h2+p>.tg:only-child{margin-left:0}
.doc h3{margin-top:1.6em}
.gloss{display:grid;gap:12px}
.gterm{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px;scroll-margin-top:90px}
.gterm:target{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.gterm h3{font-size:18px;margin:0 0 4px}.gterm p{margin:0;color:var(--mute);font-size:15.5px}
.doc pre{font-size:13px}
.pn em{display:block;font-style:italic;font-weight:400;color:var(--mute);font-size:13.5px;margin-top:6px;line-height:1.45}
.pn .next em{text-align:right}
.admonition.tip{background:#eefaf4;border-color:#c5ebd6}.admonition.tip .admonition-title{color:#0b7a53}

/* năm nguyên tắc */
.prs3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pc{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px;text-decoration:none;color:inherit;transition:transform .18s,box-shadow .18s,border-color .18s}
.pc:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#b8caf5}
.ptop{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.pnum{font:800 44px/1 var(--sans);letter-spacing:-.04em;color:#c9d9ff}
.ptop .pico{margin:0}
.pc h3{font-size:19px;margin-bottom:8px}
.pc p{margin:0 0 18px;color:var(--mute);font-size:15px;line-height:1.6}
.plink{margin-top:auto;display:inline-flex;align-items:center;gap:6px;font:600 14.5px var(--sans);color:var(--brand);text-decoration:none}
.pc:hover .plink .ic{transform:translateX(3px)}.plink .ic{transition:transform .15s}
.pc-ev{background:var(--navy);border-color:var(--navy);justify-content:center}
.pc-ev h3{color:#fff;font-size:21px}.pc-ev p{color:#c9d6f2}.pc-ev .plink{color:#fff}
.pc-ev:hover{border-color:var(--brand);background:#0f2a66}
.stl{color:var(--mute);font-size:14px;line-height:1.7;display:block}
.stl a{color:var(--brand);text-decoration:none;font-weight:500}.stl a:hover{text-decoration:underline}
.order li{display:flex;flex-direction:column}
@media (max-width:1060px){.prs3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.prs3{grid-template-columns:1fr}.pnum{font-size:36px}}

/* thứ tự gợi ý: lộ trình */
.road{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;position:relative}
.road::before{content:"";position:absolute;top:21px;left:21px;right:calc(25% - 37px);height:2px;background:var(--line2)}
.rs{position:relative}
.rn{position:relative;z-index:1;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;font:800 18px var(--sans);box-shadow:0 0 0 6px var(--tint)}
.rc{margin-top:16px;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px;height:calc(100% - 60px);display:flex;flex-direction:column}
.rc b{display:block;color:var(--navy);font-size:18px;line-height:1.35;margin-bottom:8px}
.rc p{margin:0 0 16px;color:var(--mute);font-size:14.5px;line-height:1.6}
.rchips{margin-top:auto;display:flex;flex-direction:column;gap:8px}
.rchip{display:flex;align-items:baseline;justify-content:space-between;gap:10px;background:var(--tint);border-radius:10px;padding:9px 12px;text-decoration:none;color:var(--brand-d);font:600 14px var(--sans);line-height:1.35;transition:background .15s}
.rchip:hover{background:var(--brand-soft)}
.rchip small{color:var(--mute);font-weight:500;font-size:12.5px;white-space:nowrap}
@media (max-width:1060px){.road{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:28px}.road::before{display:none}}
@media (max-width:640px){
  .road{grid-template-columns:1fr;row-gap:0;padding-left:0}
  .road::before{display:block;top:22px;bottom:22px;left:21px;right:auto;width:2px;height:auto}
  .rs{padding-left:62px;padding-bottom:20px}
  .rn{position:absolute;left:0;top:0}
  .rc{margin-top:0;height:auto}
}