/* Wepath – trang phụ (About, Privacy, Terms, AI & Child Safety) */
:root{
  --blue:#0355D2;--navy:#002A6D;--ink:#2B3A55;--body:#3D4C69;--muted:#52607A;
  --tint:#F2F7FF;--tint2:#EAF2FF;--line:#DCE8FB;--line2:#E6EEFB;--yellow:#FFC83D;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#FFFFFF;color:var(--ink);font-family:'Be Vietnam Pro',system-ui,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--blue)}a:hover{color:var(--navy)}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}
.wrap{max-width:1200px;margin:0 auto;padding:0 clamp(16px,4vw,40px)}
.ic{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* Ngôn ngữ: JS đặt data-lang trên <html>; không có JS thì hiện cả hai */
html[data-lang="vi"] body [lang="en"],html[data-lang="en"] body [lang="vi"]{display:none !important}

.skip{position:absolute;left:16px;top:-60px;z-index:100;background:var(--yellow);color:var(--navy);font-weight:700;padding:10px 16px;border-radius:10px;text-decoration:none}
.skip:focus{top:12px}

/* Header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line2)}
.site-head .wrap{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{display:flex;align-items:center}
.logo svg{height:28px;width:156px;display:block;color:var(--blue)}
.nav{display:flex;align-items:center;gap:28px;font-size:15px;font-weight:500}
.nav a{color:var(--ink);text-decoration:none}
.nav a:hover{color:var(--blue)}
.nav a[aria-current="page"]{color:var(--blue);font-weight:600}
.lang{display:none;border:1px solid #C9DAF6;border-radius:999px;padding:3px;gap:2px;flex:none}
html[data-lang] .lang{display:inline-flex}
.lang button{border:0;background:transparent;font:inherit;font-size:13px;font-weight:600;color:var(--muted);padding:0 14px;min-height:36px;border-radius:999px;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--blue);color:#FFFFFF}
@media (max-width:960px){.nav{display:none}}

/* Hero */
.page-hero{background-color:var(--tint);background-image:radial-gradient(#D6E4FA 1.2px,transparent 1.4px);background-size:26px 26px;border-bottom:1px solid var(--line2);padding:clamp(48px,7vw,88px) 0 clamp(40px,5vw,64px)}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--blue);text-transform:uppercase}
.page-hero h1{margin:14px 0 0;max-width:920px;font-family:'Lexend',sans-serif;font-weight:700;font-size:clamp(32px,4.2vw,52px);line-height:1.12;letter-spacing:-.03em;color:var(--navy);text-wrap:balance}
.lede{margin:18px 0 0;max-width:760px;font-size:clamp(17px,1.5vw,19px);color:var(--body)}
.meta{margin-top:24px;display:flex;flex-wrap:wrap;gap:8px 10px}
.chip{display:inline-flex;align-items:center;gap:6px;background:#FFFFFF;border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px;color:var(--ink)}
.chip strong{color:var(--navy);font-weight:600}

/* Văn bản */
.doc{display:flex;flex-wrap:wrap;gap:40px 72px;align-items:flex-start;padding:clamp(40px,6vw,72px) 0 clamp(64px,8vw,104px)}
.toc{flex:0 1 250px;position:sticky;top:104px;font-size:14px;line-height:1.5}
.toc-title{font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--muted);text-transform:uppercase}
.toc ol{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-direction:column;gap:10px;border-left:2px solid var(--line2)}
.toc li{padding-left:14px}
.toc a{color:var(--muted);text-decoration:none}
.toc a:hover{color:var(--blue)}
@media (max-width:960px){.toc{position:static;flex-basis:100%}}
.article{flex:1 1 560px;min-width:0;max-width:780px}
.article h2{margin:56px 0 14px;font-family:'Lexend',sans-serif;font-weight:600;font-size:clamp(22px,2.2vw,27px);line-height:1.25;letter-spacing:-.015em;color:var(--navy);scroll-margin-top:96px}
.article h2:first-child{margin-top:0}
.article h3{margin:28px 0 8px;font-size:18px;line-height:1.4;color:var(--navy)}
.article p,.article li{font-size:16.5px;color:var(--body)}
.article p{margin:0 0 14px}
.article ul,.article ol{margin:0 0 16px;padding-left:22px}
.article li{margin:7px 0}
.article li::marker{color:var(--blue)}
.article strong{color:var(--navy)}

.callout{background:var(--tint);border-radius:18px;padding:18px 22px;margin:20px 0}
.callout p:last-child{margin-bottom:0}
.callout.warn{background:#FFF8E5;border:1px solid #F7E2A8}

.kv{width:100%;border-collapse:collapse;margin:8px 0 20px;font-size:16px}
.kv th,.kv td{text-align:left;vertical-align:top;padding:14px 16px;border-bottom:1px solid var(--line2)}
.kv th{width:34%;color:var(--muted);font-weight:600;font-size:14.5px}
.kv td{color:var(--navy);font-weight:500}
.table-box{overflow-x:auto;border:1px solid var(--line);border-radius:18px;margin:12px 0 20px}
.table-box .kv{margin:0}
.table-box .kv tr:last-child th,.table-box .kv tr:last-child td{border-bottom:0}

.status{display:inline-block;white-space:nowrap;font-size:12.5px;font-weight:700;padding:3px 10px;border-radius:999px}
.status.live{background:#0355D2;color:#FFFFFF}
.status.alpha{background:#FFC83D;color:#002A6D}
.status.beta{background:var(--tint2);color:#002A6D}

.founder{display:flex;flex-wrap:wrap;gap:20px;align-items:center;background:#FFFFFF;border:1px solid var(--line);border-radius:22px;padding:24px;margin:8px 0 20px}
.founder .mono{width:64px;height:64px;border-radius:18px;background:var(--blue);color:#FFFFFF;display:flex;align-items:center;justify-content:center;font-family:'Lexend',sans-serif;font-weight:700;font-size:26px;flex:none}
.founder .name{font-family:'Lexend',sans-serif;font-weight:600;font-size:21px;color:var(--navy);line-height:1.3}
.founder .role{font-size:15px;color:var(--muted)}

.steps{list-style:none;padding:0 !important;margin:12px 0 22px !important;display:grid;gap:10px;counter-reset:s}
.steps li{counter-increment:s;display:flex;gap:14px;align-items:flex-start;background:#FFFFFF;border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin:0 !important}
.steps li::before{content:counter(s);flex:none;width:28px;height:28px;border-radius:8px;background:var(--blue);color:#FFFFFF;font-family:'Lexend',sans-serif;font-weight:600;font-size:14px;display:flex;align-items:center;justify-content:center;margin-top:1px}
.steps li.alt::before{background:var(--yellow);color:var(--navy)}

.timeline{list-style:none;padding:0 !important;margin:12px 0 20px !important;border-left:2px dashed #9CC2FF}
.timeline li{position:relative;padding:0 0 18px 24px;margin:0 !important}
.timeline li::before{content:"";position:absolute;left:-8px;top:7px;width:14px;height:14px;border-radius:999px;background:#FFFFFF;border:3px solid var(--blue)}
.timeline li.done::before{background:var(--blue)}
.timeline .when{display:block;font-family:'Lexend',sans-serif;font-weight:600;font-size:14.5px;color:var(--blue)}

.ai-label{display:inline-flex;align-items:center;gap:8px;background:#FFFFFF;border:1px solid var(--line);border-radius:12px;padding:8px 12px;font-size:14px;color:var(--muted)}
.ai-label b{font-size:11px;font-weight:700;color:#FFFFFF;background:var(--navy);padding:2px 7px;border-radius:6px;letter-spacing:.04em}
.ai-label strong{color:var(--navy)}

.contact-card{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;background:var(--navy);border-radius:22px;padding:24px 28px;margin:12px 0}
.contact-card p{margin:0 !important;color:#C7D8F5 !important}
.contact-card strong{color:#FFFFFF}
.btn{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 22px;border-radius:12px;background:var(--yellow);color:var(--navy);font-weight:700;font-size:15px;text-decoration:none}
.btn:hover{color:var(--navy);filter:brightness(1.04)}

/* Footer */
.site-foot{background:var(--navy);color:#C7D8F5;padding:clamp(48px,6vw,72px) 0 32px}
.site-foot a{color:#DCEBFF;text-decoration:none}
.site-foot a:hover{color:#FFFFFF;text-decoration:underline}
.foot-top{display:flex;flex-wrap:wrap;gap:40px 64px;justify-content:space-between}
.foot-brand{flex:1 1 300px;max-width:380px;font-size:15px}
.foot-brand svg{height:30px;width:167px;display:block;color:#FFFFFF}
.foot-brand p{margin:18px 0 0}
.foot-cols{display:flex;flex-wrap:wrap;gap:40px 64px}
.foot-cols h2{margin:0;font-size:13px;font-weight:700;letter-spacing:.1em;color:#FFFFFF;text-transform:uppercase}
.foot-cols ul{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:12px;font-size:15px}
.foot-bottom{margin-top:48px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-direction:column;gap:6px;font-size:13.5px;line-height:1.6;color:#9FB6DE}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}