/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/f1.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/f2.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/f3.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f4.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f5.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f6.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f7.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f8.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f9.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(fonts/f10.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(fonts/f11.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(fonts/f12.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f13.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f14.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/f15.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f16.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f17.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'Newsreader';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/f18.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root{
  --ink:#131A2B; --ink2:#364056; --muted:#5B6477; --line:#E2E5EC; --line2:#EEF0F4;
  --paper:#fff; --wash:#F5F6F9; --accent:#2447D6; --accent-ink:#1A36A8; --accent-soft:#E9EEFD;
  --ok:#146C36; --ok-bg:#E5F5EA; --warn:#9A4807; --warn-bg:#FDF0DC; --bad:#B91C1C; --bad-bg:#FCE8E8;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --toc:292px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16.5px/1.7 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--accent-ink);text-underline-offset:3px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:3px}
img{max-width:100%;height:auto;display:block}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}

/* ---------- shell ---------- */
.toc{position:fixed;inset:0 auto 0 0;width:var(--toc);padding:28px 22px 24px 28px;overflow:auto;border-right:1px solid var(--line);background:var(--wash);z-index:20}
.toc-brand{font:600 15px/1.3 var(--sans);margin:0 0 4px}
.toc-sub{font-size:12.5px;color:var(--muted);margin:0 0 22px;line-height:1.5}
.toc ol{list-style:none;margin:0;padding:0 0 0 14px;position:relative}
.toc ol::before{content:"";position:absolute;left:0;top:4px;bottom:4px;width:2px;background:var(--line)}
.toc-fill{position:absolute;left:0;top:4px;width:2px;height:0;background:var(--accent);transition:height .15s}
.toc li a{display:block;position:relative;padding:5px 0 5px 12px;font-size:13.5px;line-height:1.4;color:var(--ink2);text-decoration:none}
.toc li a:hover{color:var(--accent-ink)}
.toc li a b{display:inline-block;min-width:22px;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.toc li a[aria-current=true]{color:var(--accent-ink);font-weight:600}
.toc li a[aria-current=true]::before{content:"";position:absolute;left:-17px;top:50%;width:8px;height:8px;margin-top:-4px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.toc-foot{margin-top:22px;font-size:12px;color:var(--muted)}
.toc-foot button{font:inherit;font-size:12.5px;padding:6px 10px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;color:var(--ink2)}
.menu-btn{display:none}
main{margin-left:var(--toc);padding:0 56px 96px;max-width:calc(var(--toc) + 1180px)}
.col{max-width:700px}
section.sec{padding-top:88px;border-top:1px solid var(--line);margin-top:72px}

/* ---------- type ---------- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;color:var(--ink);letter-spacing:-.01em;margin:0}
h2{font-size:clamp(30px,3.4vw,42px);line-height:1.15;margin:0 0 18px;display:flex;gap:18px;align-items:baseline}
h2 .n{font:600 15px/1 var(--sans);color:#fff;background:var(--accent);border-radius:6px;padding:7px 9px;letter-spacing:0;transform:translateY(-5px);font-variant-numeric:tabular-nums}
h3{font-size:24px;line-height:1.25;margin:44px 0 12px}
h4{font:600 16px/1.4 var(--sans);margin:24px 0 6px}
p{margin:0 0 16px}
.lede{font:400 21px/1.6 var(--serif);color:var(--ink2);max-width:680px}
.small{font-size:14px;color:var(--muted)}
ul,ol{padding-left:22px;margin:0 0 16px}li{margin:4px 0}
strong{font-weight:600}
.tag{display:inline-block;font:600 12px/1 var(--sans);padding:4px 8px;border-radius:5px;background:var(--accent-soft);color:var(--accent-ink);white-space:nowrap}
.tag.m{background:#E6F0FF}.tag.s{background:var(--ok-bg);color:var(--ok)}.tag.c{background:var(--warn-bg);color:var(--warn)}.tag.w{background:var(--wash);color:var(--muted)}
.tag.r{background:var(--bad-bg);color:var(--bad)}
.pull{margin:36px 0;padding:6px 0 6px 26px;border-left:4px solid var(--accent);font:500 25px/1.45 var(--serif);color:var(--ink);max-width:700px}
.pull cite{display:block;margin-top:10px;font:400 13.5px/1.5 var(--sans);color:var(--muted)}
.callout{background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:18px 22px;margin:22px 0;max-width:760px}
.callout.warn{background:var(--warn-bg);border-color:#F1D6A6}
.callout p:last-child{margin:0}
.callout b.t{display:block;margin-bottom:4px}

/* ---------- tables ---------- */
.tw{overflow-x:auto;margin:20px 0 28px;border:1px solid var(--line);border-radius:10px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.5}
th,td{padding:10px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line2)}
thead th{position:sticky;top:0;background:var(--wash);font-weight:600;font-size:13px;color:var(--ink2);border-bottom:1px solid var(--line);white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
tbody th{font-weight:600;background:#fff}
td.c,th.c{text-align:center}
.grp td{background:var(--wash);font-weight:600;color:var(--ink2);font-size:13px}
caption{caption-side:bottom;text-align:left;padding:10px 14px;font-size:13px;color:var(--muted)}
.yes{color:var(--ok);font-weight:600}.no{color:#9AA1B2}.part{color:var(--warn);font-weight:600}
td.nowrap,.nw{white-space:nowrap}

/* ---------- figures ---------- */
figure{margin:28px 0}
figcaption{margin-top:10px;font-size:13.5px;line-height:1.55;color:var(--muted);max-width:820px}
figcaption b{color:var(--ink);font-weight:600}
.shot{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--wash)}
.shot img{width:100%}
.shots{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.shots.three{grid-template-columns:repeat(3,1fr)}
.srcnote{font-size:12.5px;color:var(--muted)}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:18px;margin:22px 0}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}
.box{border:1px solid var(--line);border-radius:10px;padding:18px 20px;background:#fff}
.box h4{margin-top:0}
.box p:last-child,.box ul:last-child{margin-bottom:0}

/* ---------- cover ---------- */
.cover{padding:56px 0 8px}
.doc-meta{font-size:13.5px;color:var(--muted);margin-bottom:28px}
.doc-meta span+span::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--muted);margin:0 10px 2px;vertical-align:middle}
.cover h1{font-size:clamp(40px,5.4vw,72px);line-height:1.04;max-width:15em;letter-spacing:-.025em}
.cover .lede{margin-top:24px}
.cascade{list-style:none;margin:40px 0 12px;padding:0;display:grid;grid-template-columns:minmax(260px,360px) 1fr;column-gap:32px;max-width:900px}
.cascade .cn{grid-column:1;border:1.5px solid var(--ink);background:#fff;border-radius:10px;padding:14px 18px 16px}
.cascade .cn.end{border-style:dashed;border-color:#9AA1B2}
.cn small{display:block;font:600 11.5px/1.3 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.cn b{display:block;margin-top:6px;font:600 17px/1.3 var(--sans)}
.cn span{display:block;margin-top:6px;font-size:13.5px;line-height:1.5;color:var(--muted)}
.cascade .cb{grid-column:1/-1;display:grid;grid-template-columns:minmax(260px,360px) 1fr;column-gap:32px;align-items:center;min-height:64px}
.cb i{grid-column:1;justify-self:center;font:700 12px/1 var(--sans);font-style:normal;width:26px;height:26px;border-radius:50%;background:var(--bad);color:#fff;display:grid;place-items:center;position:relative}
.cb i::before,.cb i::after{content:"";position:absolute;left:50%;border-left:2px dashed var(--bad);height:19px}
.cb i::before{bottom:100%}.cb i::after{top:100%}
.cb p{grid-column:2;margin:0;font-size:14px;line-height:1.5;color:var(--ink2)}
.summary{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:36px}
.summary .box{background:var(--wash);border-color:var(--line)}
.summary h3{font:600 13.5px/1.3 var(--sans);color:var(--accent-ink);margin:0 0 6px}
.summary p{font-size:15.5px;line-height:1.6}
.mvp-line{grid-column:1/-1;background:var(--ink)!important;color:#fff;border-color:var(--ink)!important}
.mvp-line h3{color:#B8C6FF}.mvp-line p{color:#fff;font:500 19px/1.5 var(--serif)}

/* ---------- competitor cards ---------- */
.comp{border:1px solid var(--line);border-radius:12px;margin:28px 0;overflow:hidden}
.comp-h{display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:space-between;align-items:baseline;padding:16px 22px;background:var(--wash);border-bottom:1px solid var(--line)}
.comp-h h3{margin:0;font-size:24px}
.comp-h .meta{font-size:13px;color:var(--muted)}
.comp-b{display:grid;grid-template-columns:1.1fr 1fr;gap:0}
.comp-b>div{padding:20px 22px}
.comp-b>div+div{border-left:1px solid var(--line)}
.comp-b h4{margin:0 0 6px;font-size:13.5px;color:var(--muted);font-weight:600}
.comp-b ul{margin-bottom:14px;font-size:15px}
.comp-img{padding:0 22px 22px}
.crit{color:var(--ink2)}

/* ---------- workflow ---------- */
.flow{display:grid;gap:0;margin:24px 0;counter-reset:st}
.step{display:grid;grid-template-columns:44px 1fr;gap:0 18px;position:relative;padding-bottom:22px}
.step::before{content:"";position:absolute;left:21px;top:44px;bottom:0;width:2px;background:var(--line)}
.step:last-child::before{display:none}
.step .dot{width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font:600 15px/1 var(--sans)}
.step .body{border:1px solid var(--line);border-radius:10px;padding:14px 18px;background:#fff}
.step h3{margin:0 0 6px;font:600 17px/1.35 var(--serif);font-family:var(--serif)}
.kv{display:grid;grid-template-columns:110px 1fr;gap:4px 14px;font-size:14px;line-height:1.55;margin:0}
.kv dt{color:var(--muted)}.kv dd{margin:0}
.lock{display:inline-flex;gap:5px;align-items:center;font-size:12.5px;font-weight:600;color:var(--warn);background:var(--warn-bg);padding:3px 8px;border-radius:5px}

/* ---------- journey ---------- */
.jt td:first-child{white-space:nowrap;font-weight:600}
.pain{color:var(--bad)}.gain{color:var(--ok)}
.persona{border:1px solid var(--line);border-radius:12px;margin:22px 0;display:grid;grid-template-columns:230px 1fr;overflow:hidden}
.persona>.who{background:var(--wash);padding:20px;border-right:1px solid var(--line)}
.persona>.who h3{margin:0 0 4px;font-size:22px}
.persona>.who p{font-size:13.5px;color:var(--muted);line-height:1.5;margin:0}
.persona>.what{padding:18px 22px;display:grid;grid-template-columns:repeat(2,1fr);gap:4px 28px}
.persona h4{margin:10px 0 4px;font-size:13.5px;color:var(--muted)}
.persona ul{font-size:14.5px;margin-bottom:6px}

/* ---------- data model diagram ---------- */
.erd{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff;padding:10px}
.erd svg{min-width:900px;width:100%;height:auto;display:block}

/* ---------- mockup frames ---------- */
.fig-wide{margin-left:0}
.frame{position:relative;border:1px solid #C9CEDA;border-radius:12px;overflow:hidden;background:#fff;box-shadow:0 1px 2px rgba(19,26,43,.05),0 14px 40px -18px rgba(19,26,43,.28);width:100%}
.frame .stage{width:1440px;height:900px;transform-origin:0 0;transform:scale(var(--s,.7));position:absolute;left:0;top:0}
.frame .chrome{position:absolute;z-index:2;inset:0 0 auto 0;height:0}
.phones{display:flex;flex-wrap:wrap;gap:36px;align-items:flex-start}
.phone{width:410px;border:1px solid #C9CEDA;border-radius:44px;padding:10px;background:#0f1424;box-shadow:0 14px 40px -18px rgba(19,26,43,.4)}
.phone .stage{width:390px;height:800px;border-radius:34px;overflow:hidden;background:#fff;position:relative}
.annot{flex:1;min-width:260px;max-width:420px}
.annot ol{padding-left:20px;font-size:14.5px}

/* ---------- misc ---------- */
.legend-i{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--ink);color:#fff;font:600 11px/1 var(--sans);margin-right:6px}
.endnote{margin-top:96px;padding-top:24px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.src li{font-size:14px;word-break:break-word}
.src h3{margin:26px 0 8px;font-size:20px}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  :root{--toc:0px}
  .toc{transform:translateX(-100%);width:min(320px,86vw);transition:transform .2s;box-shadow:0 0 40px rgba(0,0,0,.2)}
  .toc.open{transform:none}
  .menu-btn{display:block;position:fixed;right:14px;top:14px;z-index:30;font:600 13px var(--sans);background:var(--ink);color:#fff;border:0;border-radius:8px;padding:9px 13px}
  main{margin-left:0;padding:0 22px 80px}
  .g3,.shots.three{grid-template-columns:1fr}
  .comp-b{grid-template-columns:1fr}.comp-b>div+div{border-left:0;border-top:1px solid var(--line)}
  .persona{grid-template-columns:1fr}.persona>.who{border-right:0;border-bottom:1px solid var(--line)}
}
@media (max-width:640px){
  body{font-size:16px}
  .g2,.summary,.persona>.what{grid-template-columns:1fr}
  .cascade{grid-template-columns:1fr;max-width:none}
  .cascade .cb{grid-template-columns:44px 1fr;column-gap:14px;min-height:0;padding:0}
  .cb i{grid-column:1}.cb p{grid-column:2;padding:10px 0}
  .cascade .cn{grid-column:1}
  h2{flex-direction:column;gap:10px}h2 .n{transform:none;align-self:flex-start}
  .pull{font-size:21px}
  .kv{grid-template-columns:1fr}
  section.sec{padding-top:56px;margin-top:48px}
  .phone{max-width:100%}
}

/* ---------- print ---------- */
@page{size:A4;margin:16mm 14mm}
@media print{
  body{font-size:11pt;line-height:1.55}
  .toc,.menu-btn,.skip{display:none!important}
  main{margin:0;padding:0;max-width:none}
  .col{max-width:none}
  section.sec{break-before:page;border-top:0;margin-top:0;padding-top:0}
  .comp,figure,.step,.persona,.box,.tw,tr{break-inside:avoid}
  h2,h3,h4{break-after:avoid}
  .frame{box-shadow:none}
  .tw{overflow:visible}
  a{color:inherit;text-decoration:none}
  .src a{text-decoration:underline;word-break:break-all}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .phones{gap:18px}.phone{width:300px;border-radius:34px;box-shadow:none;zoom:.76}
}
@media(max-width:520px){.phone{zoom:.8}}

/* ===== Mockup design system: "Mạch" (tên tạm), scope .app ===== */
.app{--g:#146C36;--gb:#E5F5EA;--a:#9A4807;--ab:#FDF0DC;--r:#B91C1C;--rb:#FCE8E8;--bg:#F5F6F9;--bd:#E2E5EC;--tx:#131A2B;--tx2:#5B6477;--ac:#2447D6;--acb:#E9EEFD;
  display:grid;grid-template-columns:228px 1fr;grid-template-rows:56px 1fr;width:1440px;height:900px;background:var(--bg);color:var(--tx);font:400 13.5px/1.45 var(--sans);overflow:hidden;position:relative}
.app *{box-sizing:border-box}
.app .side{grid-row:1/3;background:#0F1629;color:#B9C2DC;padding:18px 12px;display:flex;flex-direction:column;gap:2px}
.app .logo{display:flex;align-items:center;gap:10px;color:#fff;font:600 16px var(--sans);padding:2px 10px 16px}
.app .logo i{width:26px;height:26px;border-radius:7px;background:var(--ac);display:grid;place-items:center;font:700 14px var(--serif);font-style:normal}
.app .nav{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:8px;color:#B9C2DC;font-size:13.5px}
.app .nav svg{width:16px;height:16px;flex:none;opacity:.85}
.app .nav.on{background:#1D2A4D;color:#fff;font-weight:600}
.app .nav .ct{margin-left:auto;background:#2447D6;color:#fff;font-size:11px;border-radius:9px;padding:1px 7px}
.app .nsec{font-size:11.5px;color:#7C87A8;padding:14px 10px 4px}
.app .me{margin-top:auto;display:flex;gap:10px;align-items:center;padding:10px;border-top:1px solid #222E50;color:#fff;font-size:12.5px}
.app .me small{display:block;color:#8D98B8;font-size:11.5px}
.app .top{display:flex;align-items:center;gap:14px;padding:0 24px;background:#fff;border-bottom:1px solid var(--bd)}
.app .top .ttl{font:600 17px var(--sans);margin:0;letter-spacing:0;color:var(--tx)}
.app .top .crumb{color:var(--tx2);font-size:12.5px}
.app .top .sp{flex:1}
.app .search{width:230px;height:32px;border:1px solid var(--bd);border-radius:8px;padding:6px 10px;color:var(--tx2);font-size:12.5px;background:var(--bg)}
.app .sel{height:32px;border:1px solid var(--bd);border-radius:8px;padding:6px 10px;font-size:12.5px;background:#fff;white-space:nowrap}
.app .av{width:28px;height:28px;border-radius:50%;background:#3C5BD8;color:#fff;display:inline-grid;place-items:center;font:600 11px var(--sans);flex:none}
.app .av.s{width:22px;height:22px;font-size:9.5px}.app .av.o{background:#B45309}.app .av.g{background:#15803D}.app .av.p{background:#7C3AED}.app .av.k{background:#475569}
.app .page{padding:18px 24px;overflow:hidden;display:flex;flex-direction:column;gap:14px;min-height:0}
.app .row{display:flex;gap:14px}.app .grow{flex:1;min-width:0}
.app .card{background:#fff;border:1px solid var(--bd);border-radius:10px;padding:14px 16px;min-width:0}
.app .card h3{font:600 13.5px var(--sans);margin:0 0 10px;letter-spacing:0;color:var(--tx);display:flex;justify-content:space-between;align-items:center}
.app .card h3 small{font:400 12px var(--sans);color:var(--tx2)}
.app .muted{color:var(--tx2)}.app .sm{font-size:12px}.app .xs{font-size:11.5px}
.app .b{font-weight:600}
.app .tn{font-variant-numeric:tabular-nums}
.app .btn{height:32px;padding:0 12px;border-radius:8px;border:1px solid var(--bd);background:#fff;font:500 12.5px var(--sans);display:inline-flex;align-items:center;gap:6px;white-space:nowrap;color:var(--tx)}
.app .btn.pri{background:var(--ac);border-color:var(--ac);color:#fff}
.app .btn.sm{height:26px;padding:0 9px;font-size:12px}
.app .chip{display:inline-flex;align-items:center;gap:5px;height:21px;padding:0 8px;border-radius:11px;font:600 11.5px var(--sans);white-space:nowrap;background:#EEF0F4;color:#475569}
.app .chip::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.app .chip.g{background:var(--gb);color:var(--g)}.app .chip.a{background:var(--ab);color:var(--a)}.app .chip.r{background:var(--rb);color:var(--r)}.app .chip.b{background:var(--acb);color:#1A36A8}
.app .chip.nd::before{display:none}
.app .bar{height:7px;border-radius:4px;background:#E8EBF1;overflow:hidden;position:relative}
.app .bar i{position:absolute;left:0;top:0;bottom:0;border-radius:4px;background:var(--g)}
.app .bar.a i{background:#D97706}.app .bar.r i{background:#DC2626}.app .bar.b i{background:var(--ac)}
.app table.t{width:100%;border-collapse:collapse;font-size:12.5px}
.app table.t th{font:600 11.5px var(--sans);color:var(--tx2);text-align:left;padding:7px 10px;background:#F8F9FB;border-bottom:1px solid var(--bd);position:static;white-space:nowrap}
.app table.t td{padding:8px 10px;border-bottom:1px solid #EEF0F4;vertical-align:middle;font-size:12.5px;line-height:1.35}
.app table.t tr:last-child td{border-bottom:0}
.app table.t td.r,.app table.t th.r{text-align:right}
.app .tabs{display:flex;gap:2px;border-bottom:1px solid var(--bd);margin:-4px 0 0}
.app .tabs span{padding:8px 14px;font-size:13px;color:var(--tx2);border-bottom:2px solid transparent}
.app .tabs span.on{color:var(--ac);border-color:var(--ac);font-weight:600}
.app .big{font:600 28px/1.1 var(--sans);letter-spacing:-.01em}
.app .pill{display:inline-block;padding:2px 8px;border-radius:6px;background:var(--bg);font-size:11.5px;color:var(--tx2)}
.app .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--g)}.app .dot.a{background:#D97706}.app .dot.r{background:#DC2626}.app .dot.n{background:#9AA1B2}
.app .sep{height:1px;background:var(--bd);margin:8px 0}
.app .ann{position:absolute;z-index:5;width:24px;height:24px;border-radius:50%;background:#E11D48;color:#fff;font:700 12px/24px var(--sans);text-align:center;box-shadow:0 0 0 3px rgba(255,255,255,.9)}
.app .iconbtn{width:30px;height:30px;border:1px solid var(--bd);border-radius:8px;display:inline-grid;place-items:center;background:#fff;color:var(--tx2)}
.app .field{border:1px solid var(--bd);border-radius:8px;padding:7px 10px;background:#fff;font-size:12.5px}
.app .lbl{font-size:11.5px;color:var(--tx2);margin-bottom:3px}
.app .heat{display:grid;gap:3px}
.app .cellh{border-radius:5px;height:34px;display:grid;place-items:center;font:600 12px var(--sans);color:#fff}
.app .cellh.g{background:#1F7F46}.app .cellh.a{background:#E0A03A;color:#3A2500}.app .cellh.r{background:#C03030}.app .cellh.n{background:#E8EBF1;color:#8A93A6}
.app .col-h{font:600 11.5px var(--sans);color:var(--tx2);text-align:center;padding:2px 0}
.app svg text{font-family:var(--sans)}
/* mobile stage */
.mob{width:390px;height:800px;background:#F5F6F9;font:400 13.5px/1.45 var(--sans);color:#131A2B;position:relative;overflow:hidden;--g:#146C36;--gb:#E5F5EA;--a:#9A4807;--ab:#FDF0DC;--r:#B91C1C;--rb:#FCE8E8;--bd:#E2E5EC;--tx2:#5B6477;--ac:#2447D6;--acb:#E9EEFD}
.mob *{box-sizing:border-box}
.mob .sb{height:44px;padding:14px 22px 0;display:flex;justify-content:space-between;font:600 12px var(--sans)}
.mob .hd{padding:6px 18px 10px;background:#fff;border-bottom:1px solid var(--bd)}
.mob .hd .ttl{font:600 18px var(--sans);margin:0}
.mob .body{padding:14px 16px;display:flex;flex-direction:column;gap:12px}
.mob .card{background:#fff;border:1px solid var(--bd);border-radius:12px;padding:14px}
.mob .tabbar{position:absolute;left:0;right:0;bottom:0;height:74px;background:#fff;border-top:1px solid var(--bd);display:grid;grid-template-columns:repeat(4,1fr);padding:8px 6px 0;font-size:11px;color:var(--tx2);text-align:center}
.mob .tabbar b{display:block;color:var(--ac)}
.mob .tabbar span{display:grid;justify-items:center;gap:2px}
.mob .tabbar svg{width:22px;height:22px}
.mob .chip{display:inline-flex;align-items:center;gap:5px;height:22px;padding:0 9px;border-radius:11px;font:600 11.5px var(--sans);background:#EEF0F4;color:#475569}
.mob .chip.g{background:var(--gb);color:var(--g)}.mob .chip.a{background:var(--ab);color:var(--a)}.mob .chip.r{background:var(--rb);color:var(--r)}.mob .chip.b{background:var(--acb);color:#1A36A8}
.mob .bar{height:8px;border-radius:4px;background:#E8EBF1;position:relative;overflow:hidden}.mob .bar i{position:absolute;inset:0 auto 0 0;background:var(--g);border-radius:4px}.mob .bar.a i{background:#D97706}
.mob .btn{height:46px;border-radius:12px;background:var(--ac);color:#fff;display:flex;align-items:center;justify-content:center;font:600 15px var(--sans)}
.mob .btn.o{background:#fff;color:#131A2B;border:1px solid var(--bd)}
.mob .field{border:1px solid var(--bd);border-radius:10px;padding:11px 12px;background:#fff;font-size:15px}
.mob .lbl{font-size:12px;color:var(--tx2);margin-bottom:4px}
.mob .muted{color:var(--tx2)}

.app p,.mob p{margin:0}.app ul,.mob ul{margin:0;padding:0;list-style:none}.app li{margin:0}
.mob .hd .ttl{font:600 18px var(--sans)}