:root{
  --blue:#1689c9;--blue-d:#0d3b66;--blue-l:#e8f4fb;--sky:#5cc0ef;
  --amber:#f5a524;--amber-l:#fff4dc;--leaf:#3fae5a;--leaf-l:#e7f6ea;--bark:#8a5a2b;
  --ink:#14213d;--muted:#5d6b82;--line:#e3e8f0;--bg:#f7f9fc;--card:#fff;--red:#e5484d;
  --r:16px;--sh:0 1px 2px rgba(16,40,80,.05),0 8px 24px rgba(16,40,80,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;cursor:pointer}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}

/* demo ribbon */
.demo-bar{background:linear-gradient(90deg,var(--blue-d),#134f86);color:#cfe6f7;font-size:13px;text-align:center;padding:7px 16px}
.demo-bar b{color:#fff}

/* header */
.hd{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line)}
.hd .wrap{display:flex;align-items:center;gap:24px;height:68px}
.hd .logo img{height:42px}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:8px 12px;border-radius:10px;font-weight:500;font-size:15px;color:#33415c}
.nav a:hover,.nav a.on{background:var(--blue-l);color:var(--blue)}
.hd .acts{display:flex;gap:8px;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 18px;font-weight:600;font-size:15px;transition:.15s;white-space:nowrap}
.btn-p{background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(22,137,201,.28)}
.btn-p:hover{background:#0f76b0;transform:translateY(-1px)}
.btn-a{background:var(--amber);color:#3b2500;box-shadow:0 6px 16px rgba(245,165,36,.3)}
.btn-a:hover{background:#eb9a12;transform:translateY(-1px)}
.btn-g{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-g:hover{border-color:#c7d2e3}
.btn-sm{padding:7px 12px;font-size:13.5px;border-radius:10px}
.burger{display:none;background:none;border:0;font-size:24px}
@media(max-width:960px){.nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:12px 20px;border-bottom:1px solid var(--line)}.nav.open{display:flex}.burger{display:block;margin-left:auto}.hd .acts .btn-g{display:none}}

/* common */
.sec{padding:84px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);background:var(--blue-l);padding:6px 12px;border-radius:99px}
h1,h2,h3{line-height:1.2;margin:0}
.h2{font-size:clamp(28px,3.4vw,40px);font-weight:800;letter-spacing:-.02em;margin:14px 0 12px}
.lead{color:var(--muted);font-size:17px;max-width:640px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh)}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g2,.g3,.g4{grid-template-columns:1fr}.sec{padding:60px 0}}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:99px;font-size:12.5px;font-weight:600}
.p-blue{background:var(--blue-l);color:var(--blue)}.p-amber{background:var(--amber-l);color:#9a5b00}.p-leaf{background:var(--leaf-l);color:#227a3b}.p-red{background:#fdecec;color:#c22}.p-gray{background:#eef1f6;color:#4a5670}
.center{text-align:center}.center .lead{margin:0 auto}

/* footer */
.ft{background:var(--blue-d);color:#b8cce0;padding:56px 0 28px;margin-top:40px}
.ft .grid{grid-template-columns:2fr 1fr 1fr 1fr}
.ft h4{color:#fff;margin:0 0 12px;font-size:15px}
.ft a{display:block;padding:3px 0;font-size:14.5px}.ft a:hover{color:#fff}
.ft .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
@media(max-width:800px){.ft .grid{grid-template-columns:1fr 1fr}}

/* toast */
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:12px 18px;border-radius:12px;font-size:14.5px;opacity:0;transition:.25s;z-index:999;box-shadow:0 10px 30px rgba(0,0,0,.25);max-width:90vw}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* zalo float */
.zalo{position:fixed;right:20px;bottom:22px;width:56px;height:56px;border-radius:50%;background:#0068ff;color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px;box-shadow:0 8px 24px rgba(0,104,255,.4);z-index:60}

/* modal */
.modal{position:fixed;inset:0;background:rgba(10,25,50,.45);display:none;align-items:center;justify-content:center;z-index:200;padding:20px}
.modal.on{display:flex}
.modal .box{background:#fff;border-radius:20px;max-width:460px;width:100%;padding:28px;box-shadow:0 30px 80px rgba(0,0,0,.25)}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13.5px;font-weight:600;color:#33415c}
.field input,.field select,.field textarea{border:1px solid var(--line);border-radius:10px;padding:11px 12px;font:inherit;font-size:15px;background:#fff}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--sky);border-color:transparent}

/* band ring */
.ring{--v:0;--c:var(--blue);width:var(--s,120px);height:var(--s,120px);border-radius:50%;background:conic-gradient(var(--c) calc(var(--v)*1%),#e9eef5 0);display:grid;place-items:center;position:relative}
.ring::before{content:"";position:absolute;inset:10px;background:#fff;border-radius:50%}
.ring span{position:relative;font-weight:800;font-size:calc(var(--s,120px)*.28)}
.ring small{position:absolute;bottom:22%;font-size:11px;color:var(--muted);font-weight:600}

.skeleton{background:linear-gradient(90deg,#eef2f7 25%,#f7f9fc 37%,#eef2f7 63%);background-size:400% 100%;animation:sk 1.2s infinite;border-radius:8px}
@keyframes sk{0%{background-position:100% 50%}100%{background-position:0 50%}}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.reveal{animation:fadeUp .6s both}