/* Mục /kienthuc — bài viết SEO của HANA Premium. Dùng chung cho mọi bài. */
:root{
  --gold:#C99A2E;--gold-soft:#F3E0A8;--orange-deep:#C9551A;--red:#A8231C;--red-deep:#7E150F;
  --brown:#5A3620;--brown-deep:#3B2113;--cream:#FFF8EC;--white:#fff;--ink:#2A1B0E;--ink-soft:#5b4733;
  --line:#ecdcc0;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;background:var(--cream);color:var(--ink);line-height:1.75;font-size:17px;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:'Lora',serif;color:var(--brown-deep);line-height:1.3}
a{color:var(--red)}
img{max-width:100%;height:auto;display:block}

.top{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.top-in{max-width:1080px;margin:auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--brown-deep);font-family:'Lora',serif;font-weight:700;font-size:1.05rem;line-height:1.2}
.brand img{width:36px;height:36px}
.brand small{display:block;font-family:'Be Vietnam Pro';font-weight:500;font-size:.6rem;letter-spacing:.2em;color:var(--orange-deep);text-transform:uppercase}
.top nav{display:flex;gap:18px;font-size:.9rem;font-weight:500}
.top nav a{text-decoration:none;color:var(--ink-soft)}
.top nav a:hover{color:var(--red)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--red),var(--orange-deep));color:#fff;text-decoration:none;font-weight:600;padding:10px 20px;border-radius:999px;font-size:.92rem;white-space:nowrap}
.btn.ghost{background:transparent;color:var(--red);border:1.5px solid var(--red)}
@media(max-width:720px){.top nav{display:none}}

.wrap{max-width:760px;margin:auto;padding:28px 16px 56px}
.crumb{font-size:.82rem;color:var(--ink-soft);margin-bottom:14px}
.crumb a{color:var(--ink-soft);text-decoration:none}
.crumb a:hover{color:var(--red)}
.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--orange-deep);margin-bottom:8px}
article h1{font-size:clamp(1.7rem,4.6vw,2.4rem);margin-bottom:12px}
.meta{font-size:.85rem;color:var(--ink-soft);margin-bottom:22px}
.lead{font-size:1.1rem;color:var(--ink-soft);margin-bottom:24px}
article h2{font-size:1.45rem;margin:36px 0 12px}
article h3{font-size:1.15rem;margin:24px 0 8px}
article p{margin-bottom:14px}
article ul,article ol{margin:0 0 16px 22px}
article li{margin-bottom:6px}
figure{margin:22px 0}
figure img{border-radius:14px;box-shadow:0 8px 30px rgba(59,33,19,.12)}
figcaption{font-size:.85rem;color:var(--ink-soft);text-align:center;margin-top:8px}
blockquote{border-left:4px solid var(--gold);background:var(--white);padding:14px 18px;border-radius:0 12px 12px 0;margin:18px 0;font-style:italic;color:var(--brown)}
.table-wrap{overflow-x:auto;margin:16px 0}
table{width:100%;border-collapse:collapse;background:var(--white);border-radius:12px;overflow:hidden;font-size:.95rem}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--gold-soft);color:var(--brown-deep);font-weight:600}
.note{font-size:.88rem;color:var(--ink-soft);background:var(--white);border:1px dashed var(--line);padding:12px 14px;border-radius:10px;margin:18px 0}

.cta{background:linear-gradient(135deg,var(--brown-deep),var(--red-deep));color:#fff;border-radius:18px;padding:26px 22px;margin:34px 0;text-align:center}
.cta h2{color:#fff;margin:0 0 8px;font-size:1.35rem}
.cta p{color:#f6e6cc;margin-bottom:16px}
.cta .row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.cta .btn{background:var(--gold);color:var(--brown-deep)}
.cta .btn.ghost{background:transparent;color:#fff;border-color:#fff}

.faq details{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600;color:var(--brown-deep)}
.faq details p{margin:10px 0 0}

.list{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{background:var(--white);border:1px solid var(--line);border-radius:16px;overflow:hidden;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(59,33,19,.12)}
.card img{aspect-ratio:1/1;object-fit:cover;width:100%}
.card .b{padding:14px 16px}
.card h2{font-size:1.1rem;margin:4px 0 6px}
.card p{font-size:.9rem;color:var(--ink-soft)}

footer{background:var(--brown-deep);color:#e9d8bd;font-size:.88rem;padding:26px 16px;text-align:center}
footer a{color:var(--gold-soft)}