:root{
  --ink:#18324e;--ink-2:#4a5e78;--red:#bc2836;--red-ink:#a11f2c;--gold:#f5a52b;
  --bg:#eef2f8;--surface:#ffffff;--field:#ffffff;--line:#d5deeb;--line-2:#b9c6d8;
  --ok:#1f7a4d;--hl:rgba(245,165,43,.42);--desk:#dfe6f0;
  --font:'Be Vietnam Pro','Segoe UI',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color-scheme:light;
  box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --ink:#e6edf7;--ink-2:#a9b8cc;--red:#ef5f6b;--red-ink:#ff8a93;--gold:#f5b44c;
  --bg:#0f1825;--surface:#172334;--field:#0f1a29;--line:#2a3a50;--line-2:#3a4e68;--ok:#58c08b;--desk:#0b131e;color-scheme:dark}}
:root[data-theme="dark"]{--ink:#e6edf7;--ink-2:#a9b8cc;--red:#ef5f6b;--red-ink:#ff8a93;--gold:#f5b44c;
  --bg:#0f1825;--surface:#172334;--field:#0f1a29;--line:#2a3a50;--line-2:#3a4e68;--ok:#58c08b;--desk:#0b131e;color-scheme:dark}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.45 var(--font);-webkit-text-size-adjust:100%}
body.lock{overflow:hidden}
button,input,textarea{font:inherit;color:inherit}
.sr{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}

.top{background:var(--surface);border-bottom:1px solid var(--line)}
.top .in{max-width:1240px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.logo{height:34px;width:auto;display:block}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .logo{background:#fff;border-radius:6px;padding:3px 6px;height:40px}}
.demo{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:.86rem;color:var(--ink-2)}
.demo b{color:var(--red-ink);font-weight:700}
.linkbtn{background:none;border:0;padding:4px 2px;color:var(--ink);text-decoration:underline;text-underline-offset:3px;cursor:pointer;font-size:.86rem}

.hero{max-width:1240px;margin:0 auto;padding:28px 20px 8px}
.hero h1{margin:0;font-size:clamp(1.6rem,1.1rem + 2vw,2.35rem);line-height:1.15;letter-spacing:-.02em;font-weight:800;max-width:22ch}
.hero p{margin:10px 0 0;color:var(--ink-2);max-width:62ch}

.layout{max-width:1240px;margin:0 auto;padding:18px 20px 60px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,520px);gap:28px;align-items:start}
.formcol{min-width:0}
.rail{list-style:none;margin:0 0 16px;padding:0;display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.rail::-webkit-scrollbar{display:none}
.rail button{display:flex;align-items:center;gap:8px;white-space:nowrap;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 14px 6px 6px;cursor:pointer;font-size:.86rem;color:var(--ink-2)}
.rail .n{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--bg);font-weight:700;font-size:.8rem;color:var(--ink)}
.rail button.on{border-color:var(--ink);color:var(--ink);font-weight:600}
.rail button.on .n{background:var(--ink);color:var(--surface)}
.rail button.done .n{background:var(--ok);color:#fff}
.rail button.done .n::after{content:"✓"}.rail button.done .n{font-size:0}.rail button.done .n::after{font-size:.8rem}

.card{container-type:inline-size;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:26px 26px 22px}
.step header{margin-bottom:14px}
.count{margin:0 0 2px;font-size:.92rem;color:var(--red-ink);font-weight:600}
.step h2{margin:0;font-size:1.6rem;line-height:1.25;letter-spacing:-.01em}
.step h2:focus{outline:none}
.desc{margin:4px 0 0;color:var(--ink-2);font-size:1.02rem;max-width:60ch}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 18px}
.fld{grid-column:1/-1;min-width:0;border:0;margin:0;padding:0}
.fld.half{grid-column:span 1}
.fld label,.fld legend,.lbl{display:block;font-weight:600;font-size:1.06rem;line-height:1.3;margin-bottom:5px;padding:0}
.en{display:inline;font-weight:400;font-size:.86rem;color:var(--ink-2);margin-left:8px;font-style:italic}
.fld.half>label{display:flex;align-items:baseline;min-width:0;white-space:nowrap}
.fld.half>label .vi{flex:none}
.fld.half>label .en{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis}
.fld.half>legend{white-space:nowrap}
@container (max-width:520px){.grid{grid-template-columns:1fr}.fld.half{grid-column:1/-1}}
.req{color:var(--red);margin-left:3px}
input[type=text],input[type=tel],input[type=email],input[type=date],textarea{width:100%;background:var(--field);border:1.5px solid var(--line-2);border-radius:10px;padding:9px 12px;font-size:1.08rem;min-height:46px;transition:border-color .15s}
input.up,textarea{text-transform:uppercase}
input::placeholder,textarea::placeholder{color:var(--ink-2);opacity:.55;text-transform:none}
input:focus,textarea:focus{border-color:var(--ink);outline:none;box-shadow:0 0 0 3px var(--hl)}
input:disabled{opacity:.5}
textarea{resize:vertical;min-height:84px;line-height:1.4}
.hint{display:block;font-size:.9rem;line-height:1.35;color:var(--ink-2);margin-top:3px}
.err{display:block;font-size:.92rem;color:var(--red-ink);font-weight:600;margin-top:5px}
.err:empty{display:none}
.fld.bad input,.fld.bad textarea{border-color:var(--red)}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opt{position:relative;margin:0!important;font-weight:500!important}
.opt input{position:absolute;opacity:0;inset:0;cursor:pointer}
.opt span{display:inline-block;border:1.5px solid var(--line-2);border-radius:10px;padding:8px 18px;font-size:1.05rem;background:var(--field);min-height:44px;line-height:1.5;cursor:pointer}
.opt input:checked+span{background:var(--ink);border-color:var(--ink);color:var(--surface)}
.opt input:focus-visible+span{outline:3px solid var(--gold);outline-offset:2px}
.fld.bad .opt span{border-color:var(--red)}
.q{border-top:1px solid var(--line);padding-top:10px}
.q legend{font-weight:500;font-size:1.05rem;float:left;width:100%;margin-bottom:8px}
.q .opts{clear:both}
.q .opt span{min-width:86px;text-align:center}
.fld.off{display:none}
.sec{grid-column:1/-1;border-top:1px solid var(--line);padding-top:12px;margin-top:4px;display:flex;align-items:baseline;gap:6px 18px;flex-wrap:wrap}
.sec:first-child{border-top:0;padding-top:0;margin-top:0}
.sec h3{margin:0;font-size:1.15rem}
.same{display:flex;gap:8px;align-items:center;font-size:1rem;cursor:pointer}
.same input,.check input{width:20px;height:20px;accent-color:var(--ink);flex:none}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:500!important;cursor:pointer}
.check input{margin-top:3px}
.consent{border-top:1px solid var(--line);padding-top:16px}
.sign-note{margin:10px 0 0;font-size:.95rem;color:var(--ink-2);background:var(--bg);border-radius:10px;padding:10px 12px}
.photo-row{display:flex;gap:16px;align-items:flex-start}
.thumb{width:70px;height:90px;flex:none;border:1.5px dashed var(--line-2);border-radius:6px;background:var(--bg) center/cover no-repeat}
.thumb.has{border-style:solid}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:12px 20px;min-height:48px;font-weight:700;font-size:1rem;cursor:pointer;border:1.5px solid transparent;text-decoration:none}
.btn.small{min-height:40px;padding:8px 14px;font-size:.92rem}
.btn.red{background:var(--red);color:#fff}
.btn.red:hover{background:var(--red-ink)}
.btn.ink{background:var(--ink);color:var(--surface)}
.btn.ghost{background:var(--surface);border-color:var(--line-2);color:var(--ink)}
.btn:disabled{opacity:.6;cursor:progress}
.nav{display:flex;gap:10px;justify-content:space-between;align-items:center;margin-top:18px;padding-top:16px;border-top:1px solid var(--line);flex-wrap:wrap}
.nav .right{display:flex;gap:10px;margin-left:auto;flex-wrap:wrap}
.privacy{margin:14px 2px 0;font-size:.9rem;color:var(--ink-2)}

/* paper */
.papercol{position:sticky;top:16px}
.papercol .bar{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.papercol .bar p{margin:0;font-size:.86rem;color:var(--ink-2);margin-right:auto}
.tab{white-space:nowrap;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:5px 12px;font-size:.84rem;cursor:pointer;color:var(--ink-2)}
.tab[aria-pressed="true"]{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.desk{background:var(--desk);border-radius:16px;padding:14px}
.paper{position:relative;container-type:inline-size;aspect-ratio:595.32/841.92;background:#fff;box-shadow:0 1px 2px rgba(24,50,78,.18),0 10px 30px -12px rgba(24,50,78,.35);border-radius:2px;overflow:hidden}
.paper>img{position:absolute;inset:0;width:100%;height:100%;display:block}
.layer{position:absolute;inset:0;pointer-events:none}
.tx{position:absolute;white-space:pre;color:#0d2e73;font-family:Helvetica,Arial,sans-serif;line-height:1;transform:translateY(0)}
.mk{position:absolute;display:grid;place-items:center;color:#0d2e73;font:700 calc(9 / 595.32 * 100cqw)/1 Helvetica,Arial,sans-serif}
.ph{position:absolute;object-fit:cover}
.hl{position:absolute;background:var(--hl);border-radius:2px;mix-blend-mode:multiply;transition:all .25s ease}
@media (prefers-reduced-motion: reduce){.hl{transition:none}}
.peek,.peek-close{display:none}
/* stepper ngang 1 - 2 - 3 - 4 - 5 - 6 */
.rail{grid-column:1/-1;list-style:none;margin:0;padding:14px 18px;display:flex;align-items:center;gap:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:visible;flex-wrap:nowrap!important}
.rail li{display:flex;align-items:center;flex:1 1 auto;min-width:0}
.rail li:last-child{flex:0 0 auto}
.rail li:not(:last-child)::after{content:"";flex:1 1 auto;height:2px;min-width:12px;background:var(--line-2);margin:0 10px;border-radius:2px}
.rail li.passed::after{background:var(--ok)}
.rail button{display:flex;align-items:center;gap:8px;white-space:nowrap;border:0;background:none;border-radius:999px;padding:4px 6px 4px 4px;cursor:pointer;font-size:.98rem;color:var(--ink-2);min-width:0}
.rail .t{overflow:hidden;text-overflow:ellipsis}
.rail .n{display:grid;place-items:center;width:30px;height:30px;flex:none;border-radius:50%;background:var(--bg);border:1.5px solid var(--line-2);font-weight:700;font-size:.85rem;color:var(--ink)}
.rail button.on{color:var(--ink);font-weight:700}
.rail button.on .n{background:var(--ink);border-color:var(--ink);color:var(--surface)}
.rail button.done .n{background:var(--ok);border-color:var(--ok);color:#fff;font-size:0}
.rail button.done .n::after{content:"✓";font-size:.85rem}
@media (max-width:900px){.rail button:not(.on) .t{display:none}}
@media (max-width:560px){.rail{padding:10px 12px;min-width:0}.rail button{padding:0;gap:6px}.rail li:not(:last-child)::after{margin:0 4px;min-width:6px}.rail .n{width:26px;height:26px;font-size:.8rem}.rail button.on .t{font-size:.84rem}}


dialog[open]{display:flex;flex-direction:column}
dialog{max-height:min(88vh,860px);overflow:hidden;border:0;border-radius:18px;padding:0;max-width:min(680px,calc(100vw - 24px));width:100%;background:var(--surface);color:var(--ink);box-shadow:0 30px 80px -20px rgba(0,0,0,.5)}
dialog::backdrop{background:rgba(12,22,36,.55)}
.dlg-h{padding:22px 24px 12px}
.dlg-h h2{margin:0 0 6px;font-size:1.3rem}
.dlg-h p{margin:0;color:var(--ink-2);font-size:.92rem}
.code{display:inline-block;font-weight:800;color:var(--ink);background:var(--bg);border-radius:6px;padding:1px 8px}
.tbl{flex:1 1 auto;min-height:0;overflow:auto;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tbl table{width:100%;border-collapse:collapse;font-size:.86rem}
.tbl th,.tbl td{text-align:left;vertical-align:top;padding:8px 24px;border-bottom:1px solid var(--line)}
.tbl th{font-weight:500;color:var(--ink-2);width:44%}
.tbl td{font-weight:600;word-break:break-word}
.empty{color:var(--ink-2);font-weight:400;font-style:italic}
.dlg-f{padding:14px 24px 20px;display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
.dlg-f p{margin:0;font-size:.84rem;color:var(--ink-2);max-width:44ch}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--surface);padding:12px 18px;border-radius:12px;font-size:.92rem;max-width:calc(100vw - 32px);z-index:50;box-shadow:0 10px 30px -10px rgba(0,0,0,.5)}

.zoom{display:none}
@media (max-width:980px){
  .zoom{display:inline-flex}.papercol .bar p{display:none}.papercol .bar .zoom{margin-right:auto}
  .desk{overflow-x:auto}.desk.big .paper{width:180%}
  .layout{grid-template-columns:1fr;padding-bottom:110px}
  .papercol{position:fixed;inset:0;z-index:40;background:var(--bg);padding:calc(14px + env(safe-area-inset-top,0px)) 14px calc(14px + env(safe-area-inset-bottom,0px));overflow:auto;display:none}
  .papercol.open{display:block}
  .peek{display:inline-flex;position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:30;box-shadow:0 10px 24px -8px rgba(12,22,36,.5)}
  .peek-close{display:inline-flex}
  .desk{padding:8px}
}
@media (max-width:560px){
  .card{padding:20px 16px 18px;border-radius:14px}
  .grid{grid-template-columns:1fr}
  .fld.half{grid-column:1/-1}
  .hero{padding-top:20px}
  .layout{padding-left:12px;padding-right:12px}
  .top .in{padding:10px 14px}
  .demo{margin-left:0;width:100%}
  .nav .btn{flex:1}
  .nav .right{width:100%}
}

/* bản online */
.top .in a.home{display:block}
.top nav{margin-left:auto;display:flex;gap:18px;align-items:center;font-size:.95rem;flex-wrap:wrap}
.top nav a{color:var(--ink);text-decoration:none;font-weight:500}
.top nav a:hover{text-decoration:underline;text-underline-offset:3px}
.editbar{max-width:1240px;margin:14px auto 0;padding:0 20px}
.editbar .in{background:#fff6e6;border:1.5px solid var(--gold);border-radius:14px;padding:12px 16px;display:flex;gap:10px 16px;align-items:center;flex-wrap:wrap;color:#18324e}
.editbar b{font-weight:800}
.editbar .linkbtn{margin-left:auto;color:#18324e}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.linkrow{display:flex;gap:8px;margin:12px 24px 0}
.linkrow input{flex:1;min-width:0;font-size:.9rem;min-height:42px;padding:8px 10px;border:1.5px solid var(--line-2);border-radius:10px;background:var(--field);text-transform:none}
.dlg-b{padding:0 0 6px}
.dlg-b p{margin:10px 24px 0;font-size:.95rem;color:var(--ink-2)}
.dlg-f .acts{display:flex;gap:10px;flex-wrap:wrap;margin-left:auto}
@media (max-width:560px){.top nav{display:none}.linkrow{margin:12px 16px 0;flex-direction:column}.dlg-b p{margin:10px 16px 0}}