:root{--teal:#1d6473;--coral:#e8853f;--gold:#eab308;--cream:#fdfcf9;--sand:#f2ede3;--border:#e6ddcd;--ink:#2b2723;--muted:#6f6858;--zalo:#0068FF}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Be Vietnam Pro',system-ui,sans-serif;background:var(--cream);color:var(--ink);line-height:1.65}
img{max-width:100%;display:block}
a{color:var(--teal);text-decoration:none}
.wrap{max-width:820px;margin:0 auto;padding:0 16px}
.wrap-wide{max-width:1180px;margin:0 auto;padding:0 16px}
h1{font-size:clamp(26px,4.5vw,40px);font-weight:900;line-height:1.18;margin:0 0 14px;text-wrap:balance}
h2{font-size:clamp(21px,3vw,28px);font-weight:800;margin:34px 0 14px}
h3{font-size:19px;font-weight:800;margin:20px 0 8px}
p{margin:0 0 16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-family:inherit;font-weight:800;border-radius:12px;font-size:15px;padding:13px 20px}
.btn-coral{background:var(--coral);color:#fff}.btn-teal{background:var(--teal);color:#fff}.btn-zalo{background:var(--zalo);color:#fff}.btn-ghost{background:transparent;border:1.5px solid var(--teal);color:var(--teal)}
header.site{position:sticky;top:0;z-index:60;background:rgba(253,252,249,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
header.site .wrap-wide{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:10px;padding-bottom:10px}
.logo{font-size:20px;font-weight:900;color:var(--teal)}
header nav{display:flex;gap:22px}header nav a{color:var(--ink);font-size:14.5px;font-weight:500}
.crumb{font-size:13px;color:var(--muted);margin:0 0 12px}
.cc{color:var(--coral)}.tc{color:var(--teal)}
.box{background:var(--sand);border-radius:14px;padding:20px 24px;margin:18px 0}
.callout{background:rgba(29,100,115,.06);border-radius:14px;padding:22px;text-align:center;margin:24px 0}
figure{margin:22px 0}figure img{border-radius:14px}figcaption{font-size:13px;color:var(--muted);text-align:center;padding:8px}
details{background:#fff;border:1px solid var(--border);border-radius:12px;margin-bottom:10px;padding:0 18px}
details summary{cursor:pointer;font-weight:700;font-size:15.5px;padding:15px 0;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";font-size:22px;color:var(--coral)}
details[open] summary::after{content:"–"}
details>div{padding:0 0 16px;color:var(--muted);font-size:15px}
footer.site{background:var(--ink);color:#f5efe4;text-align:center;padding:34px 16px;margin-top:40px}
footer.site a{color:var(--coral)}
.fnav{display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin:12px 0;font-size:14px}
.grid-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden;color:inherit;display:flex;flex-direction:column}
.card img{height:180px;width:100%;object-fit:cover}
.card .cb{padding:16px;display:flex;flex-direction:column;gap:8px}
.tag{align-self:flex-start;padding:3px 10px;border-radius:999px;font-size:11px;font-weight:700;background:rgba(29,100,115,.1);color:var(--teal)}
@media(max-width:860px){header nav{display:none}.grid-cards{grid-template-columns:1fr}}