@font-face{font-family:'AR';font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/ar-600-vi.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}
@font-face{font-family:'AR';font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/ar-600-la.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}
@font-face{font-family:'AR';font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/ar-700-vi.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}
@font-face{font-family:'AR';font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/ar-700-la.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}
@font-face{font-family:'NS';font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/ns-400-vi.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}
@font-face{font-family:'NS';font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/ns-400-la.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}
@font-face{font-family:'NS';font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/ns-600-vi.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}
@font-face{font-family:'NS';font-style:normal;font-weight:600;font-display:swap;src:url(../fonts/ns-600-la.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{--bg:#f7f7fe;--paper:#fff;--ink:#1e1b4b;--mute:#585a7a;--line:#e1e2f4;--acc:#4f46e5;--acc-d:#4338ca;--soft:#eef0ff;--g:20px;--head:'AR',system-ui,sans-serif;--ff:'NS',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif}
@media (max-width:560px){:root{--g:16px}}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:20px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.65 var(--ff);overflow-x:clip}
img,svg{max-width:100%;height:auto}
a{color:var(--acc-d)}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px;border-radius:6px}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2,h3{font-family:var(--head);font-weight:700;line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h2{font-size:clamp(24px,3vw,32px)}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;z-index:99;background:#fff;color:#000;padding:8px 14px}.skip:focus{left:8px}
.wrap{width:100%;max-width:1100px;margin:0 auto;padding:0 var(--g)}
.btn{display:inline-flex;align-items:center;justify-content:center;border:0;background:var(--acc);color:#fff;font-weight:600;border-radius:10px;padding:0 16px;min-height:44px;text-decoration:none}
.btn:hover{background:var(--acc-d);color:#fff}
.ghost{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;border-radius:10px;padding:0 14px;min-height:44px;font-weight:600}
.is-ok{background:#16a34a!important;color:#fff!important;border-color:#16a34a!important}
.hd{background:#fff;border-bottom:1px solid var(--line)}
.hd__in{display:flex;align-items:center;gap:16px;min-height:62px;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:700 19px/1 var(--head)}
.hd__nav{margin-left:auto}
.hd__nav ul{display:flex;gap:2px;list-style:none;margin:0;padding:0}
.hd__nav a{display:block;padding:8px 11px;border-radius:8px;color:var(--mute);text-decoration:none;font-weight:600;font-size:15px}
.hd__nav a:hover{background:var(--soft);color:var(--acc-d)}
.hd__btn{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;position:relative}
.hd__btn span:first-child,.hd__btn span:first-child::before,.hd__btn span:first-child::after{position:absolute;left:12px;width:20px;height:2px;background:var(--ink);border-radius:2px;content:''}
.hd__btn span:first-child{top:21px}.hd__btn span:first-child::before{left:0;top:-6px}.hd__btn span:first-child::after{left:0;top:6px}
@media (max-width:980px){.hd__btn{display:block}.hd__nav{position:absolute;left:0;right:0;top:100%;z-index:30;background:#fff;border-bottom:1px solid var(--line);display:none;padding:8px var(--g) 14px}.hd__nav.is-open{display:block}.hd__nav ul{flex-direction:column}}
.hero{background:linear-gradient(180deg,#fff,var(--bg));border-bottom:1px solid var(--line);padding:34px 0 30px}
.hero__in{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:28px;align-items:center}
.hero h1{font-size:clamp(30px,4.6vw,50px);margin:0 0 12px}
.hero h1 span{display:block;color:var(--acc);font-size:.55em;margin-top:6px}
.hero p{color:var(--mute);margin:0}
.big{display:flex;flex-direction:column;align-items:center;gap:8px;border:2px dashed var(--acc);background:#fff;border-radius:22px;padding:22px;text-align:center}
.big__box{display:flex;align-items:center;gap:4px;font:600 42px/1 var(--head);color:var(--acc)}
.big__box i{display:inline-block;min-width:1.2em;height:1.1em;background:repeating-linear-gradient(45deg,var(--soft) 0 6px,#fff 6px 12px);border-radius:6px;font-style:normal;color:transparent}
.big b{font-size:19px}.big small{color:var(--mute)}
.big:hover{background:var(--soft)}
@media (max-width:760px){.hero__in{grid-template-columns:minmax(0,1fr)}}
.sec{margin-top:56px}
.sec__p{color:var(--mute);margin:-4px 0 14px}
.bl{display:grid;gap:10px}
.bc{display:grid;grid-template-columns:96px minmax(0,1fr) auto;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px}
.bc__vis{display:flex;align-items:center;justify-content:center;font:600 32px/1 var(--head);color:var(--mute);background:var(--bg);border-radius:12px;height:72px}
.bc__vis i{font-style:normal;background:repeating-linear-gradient(45deg,#c7d2fe 0 4px,transparent 4px 8px);color:transparent;border-radius:4px}
.bc h3{font-size:18px;margin:0}
.bc__code{margin:2px 0;font-size:14px;color:var(--mute)}
.bc__code code{background:var(--soft);border-radius:4px;padding:1px 6px;color:var(--acc-d)}
.bc__where,.bc__note{margin:2px 0;font-size:15px}
.bc__note{color:var(--mute)}
.bc__acts{display:flex;flex-direction:column;gap:6px}
@media (max-width:700px){.bc{grid-template-columns:64px minmax(0,1fr)}.bc__vis{height:56px;font-size:24px}.bc__acts{grid-column:1/-1;flex-direction:row}.bc__acts>*{flex:1}}
.panel{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}
.panel--col{flex-direction:column;align-items:stretch}
.panel__hint{flex-basis:100%;margin:0;color:var(--mute);font-size:14px}
.fld{display:flex;flex-direction:column;gap:4px;font-size:14px;font-weight:600;color:var(--mute)}
.fld select,.fld input{border:1px solid var(--line);border-radius:10px;min-height:44px;padding:0 10px;font-size:16px;color:var(--ink);background:var(--bg);min-width:0}
.fld--wide input{width:100%;font-size:18px}
.seg{display:inline-flex;flex-wrap:wrap;gap:4px;background:var(--soft);border-radius:12px;padding:4px;align-self:flex-start}
.seg button{border:0;background:none;border-radius:9px;min-height:38px;padding:0 12px;font-weight:600;color:var(--mute)}
.seg button[aria-checked=true]{background:#fff;color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.out{font-size:24px;margin:0;background:var(--bg);border-radius:12px;padding:12px 14px;overflow-wrap:anywhere;min-height:56px}
.out .dot,.reveal .inv{background:#c7d2fe;color:var(--acc-d);border-radius:4px;font-size:.6em;padding:2px 4px;margin:0 1px;vertical-align:middle}
.out .dot{color:transparent;background:repeating-linear-gradient(45deg,#c7d2fe 0 4px,#e0e7ff 4px 8px)}
.tester{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;font-size:18px;background:#fff;resize:vertical}
.reveal{margin-top:10px;background:#fff;border:1px dashed var(--line);border-radius:12px;padding:12px;min-height:56px;font-size:20px;overflow-wrap:anywhere}
.reveal .inv{font-size:12px;font-family:var(--head)}
.reveal .inv--sp{background:#f1f5f9;color:#94a3b8}
.reveal__sum{font-size:14px;color:var(--mute);margin:8px 0 0}
.guide{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.guide div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
.guide b{display:block;font-family:var(--head);margin-bottom:6px}
.guide p{margin:0;color:var(--mute);font-size:15px}
@media (max-width:900px){.guide{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.guide{grid-template-columns:minmax(0,1fr)}}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:8px}
.faq summary{cursor:pointer;padding:14px 16px;font-weight:600}
.faq p{margin:0;padding:0 16px 14px;color:var(--mute)}
.fb{margin:10px 0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
.fb__head{display:flex;gap:12px;align-items:center}
.fb__ic{display:grid;place-items:center;width:46px;height:46px;border-radius:12px;background:var(--soft);color:var(--acc-d)}
.fb__t{font-size:18px;margin:0}
.fb__s{margin:2px 0 0;color:var(--mute);font-size:14px}
.fb__btns{display:flex;gap:8px}
.fb__b{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:10px;min-height:44px;padding:0 14px;font-weight:600}
.fb__b--up[aria-pressed=true]{background:#dcfce7;border-color:#16a34a}
.fb__b--down[aria-pressed=true]{background:#ffe4e6;border-color:#e11d48}
.fb__form{flex-basis:100%;display:grid;gap:8px}
.fb__form textarea{border:1px solid var(--line);border-radius:10px;padding:10px}
.btn--sm{min-height:40px}
.fb__thx{flex-basis:100%;margin:0;color:#166534;font-weight:600}
.pg{padding-top:28px;padding-bottom:20px}
.pg__t{font-size:clamp(26px,3.6vw,40px)}
.prose{max-width:780px}
.prose table{width:100%;border-collapse:collapse}.prose th,.prose td{border:1px solid var(--line);padding:8px}
.cs-scroll{overflow-x:auto}
.list{list-style:none;padding:0;display:grid;gap:8px}.list li{display:flex;justify-content:space-between;gap:12px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.pg--404{text-align:center;padding:60px var(--g)}.code404{font:700 72px/1 var(--head);color:var(--acc);margin:0}
.ft{margin-top:60px;background:var(--ink);color:#c7c9ef;padding:32px 0 20px}
.ft__in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}
.ft__in p{max-width:460px;margin:8px 0 0}
.ft__brand{font:700 19px/1 var(--head);color:#fff;margin:0!important}
.ft__links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,auto);gap:2px 24px;align-content:start}
.ft__links--row{display:flex;flex-wrap:wrap;margin-top:14px}
.ft__links a{color:#fff;text-decoration:none;display:inline-block;padding:6px 0;font-weight:600}
.ft__note,.ft__copy{font-size:13px;color:#9a9dd0;margin:18px auto 0}
.ft__copy{margin-top:4px}
.toast{position:fixed;left:50%;bottom:20px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-weight:600;z-index:90;box-shadow:0 10px 30px -10px rgba(0,0,0,.5)}