/* Bài viết — Master Nguyễn Hà (emerald + gold, đồng bộ trang chủ) */
:root{
  --green:#0B7A4B;--green-light:#2FA46E;--green-dark:#064A2E;--green-soft:#D8EDE2;
  --gold:#C79A3A;--gold-deep:#A97F26;--gold-soft:#F3E9CE;
  --bg:#F5F1E8;--surface:#FBF8F1;--surface2:#FFFFFF;--border:#E3DBC9;--border-strong:#D6CBB4;
  --text:#211E17;--muted:#544C3F;--text-muted:#6E6558;--cream:#FFFDF8;--ink:#1A1710;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--text);line-height:1.8;font-size:18.5px;font-weight:400;
  background-color:var(--bg);
  background-image:radial-gradient(circle at top center,rgba(216,237,226,0.42) 0%,rgba(245,241,232,0.9) 42%,var(--bg) 100%);
  background-attachment:fixed;}
a{color:var(--green-dark)}
img{max-width:100%;height:auto;display:block;border-radius:12px}
.logo-role{font-size:0.6em;color:var(--gold-deep);letter-spacing:.04em;margin-right:.14em;font-weight:800;text-transform:uppercase}

/* Nav */
.nav{position:sticky;top:0;z-index:100;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 2px 16px rgba(20,16,8,0.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1160px;margin:0 auto;padding:0 24px}
.logo{display:flex;align-items:center;gap:8px;font-family:'Playfair Display',serif;font-size:1.42rem;font-weight:800;color:var(--text)}
.logo .shield{color:var(--green);font-size:1.24rem}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:var(--text);font-weight:600;font-size:0.98rem;transition:color .2s;text-decoration:none}
.nav-links a:hover{color:var(--green)}
.nav-cta{background:var(--green);color:#fff!important;padding:10px 20px;border-radius:30px;font-weight:700;font-size:0.92rem;transition:background .2s}
.nav-cta:hover{background:var(--green-dark)}
.hamb{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.hamb span{width:25px;height:2.5px;background:var(--text);border-radius:2px;transition:.3s}
@media(max-width:720px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;background:var(--surface2);border-bottom:1px solid var(--border);padding:20px 24px;gap:18px;align-items:flex-start;box-shadow:0 8px 20px rgba(20,16,8,0.1)}
  .nav-links.open{display:flex}
  .hamb{display:flex}
}

/* Article */
.post-wrap{max-width:780px;margin:0 auto;padding:50px 24px 84px}
.post-eyebrow{color:var(--gold-deep);font-weight:800;letter-spacing:.13em;text-transform:uppercase;font-size:0.82rem;margin-bottom:14px}
.post-title{font-family:'Playfair Display',serif;font-weight:800;font-size:clamp(2rem,4.6vw,3rem);line-height:1.2;color:var(--text);margin-bottom:16px}
.post-meta{color:var(--text-muted);font-size:0.96rem;margin-bottom:30px;font-weight:600}
.post-cover{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:16px;margin-bottom:40px;border:1px solid var(--border-strong)}
.post-cover-grad{width:100%;aspect-ratio:16/9;border-radius:16px;margin-bottom:40px;background:linear-gradient(135deg,var(--green),var(--green-dark));display:flex;align-items:center;justify-content:center;font-size:4.5rem;color:rgba(255,255,255,0.94);box-shadow:0 16px 40px rgba(11,122,75,0.18)}
.post-lead{font-size:1.24rem;line-height:1.7;color:var(--muted);font-weight:600;margin-bottom:30px;padding-left:20px;border-left:4px solid var(--gold)}
.post-body{font-size:1.12rem}
.post-body p{margin:0 0 22px}
.post-body h2{font-family:'Playfair Display',serif;font-size:1.72rem;font-weight:800;margin:42px 0 16px;color:var(--green-dark)}
.post-body h3{font-family:'Playfair Display',serif;font-size:1.36rem;font-weight:700;margin:32px 0 12px;color:var(--green-dark)}
.post-body ul,.post-body ol{margin:0 0 22px 1.3em}
.post-body li{margin-bottom:10px}
.post-body img{margin:26px auto;box-shadow:0 12px 30px rgba(20,16,8,0.1)}
.post-body figure{margin:26px 0}
.post-body figcaption{text-align:center;color:var(--text-muted);font-size:0.9rem;margin-top:8px;font-weight:500}
.post-body blockquote{border-left:4px solid var(--gold);background:var(--surface);padding:18px 24px;margin:26px 0;border-radius:0 12px 12px 0;color:var(--muted);font-style:italic;font-weight:600;font-size:1.1rem}
.post-body a{color:var(--green-dark);text-decoration:underline;text-underline-offset:3px;font-weight:600}
.post-body strong{color:var(--text);font-weight:700}
.callout{background:var(--gold-soft);border:1px solid var(--border-strong);border-radius:14px;padding:22px 26px;margin:30px 0}
.callout h3{margin:0 0 8px;color:var(--gold-deep);font-family:'Playfair Display',serif;font-size:1.2rem}
.callout p{margin:0;color:var(--muted);font-weight:500}

/* Kết bài + CTA + disclaimer */
.post-end{margin-top:50px;padding-top:30px;border-top:1px solid var(--border)}
.post-sign{font-family:'Playfair Display',serif;font-style:italic;color:var(--green-dark);font-size:1.5rem;font-weight:700;margin-bottom:6px}
.post-disclaimer{margin-top:24px;font-size:0.94rem;color:var(--text-muted);line-height:1.6;font-weight:500;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px 20px}
.post-cta{margin-top:30px;background:linear-gradient(135deg,var(--green-dark),#053b25);border-radius:18px;padding:38px 32px;text-align:center;color:#F1EEE2}
.post-cta h3{font-family:'Playfair Display',serif;color:#fff;font-size:1.5rem;font-weight:800;margin-bottom:10px}
.post-cta p{color:#DCEBE0;margin-bottom:22px;font-size:1.04rem;font-weight:500}
.post-cta a{display:inline-block;background:var(--gold);color:var(--ink);padding:14px 30px;border-radius:30px;font-weight:800;text-decoration:none}
.post-nav-bottom{margin-top:36px;text-align:center}
.post-nav-bottom a{display:inline-block;color:var(--green-dark);font-weight:700;border:1px solid var(--border-strong);background:var(--cream);padding:13px 28px;border-radius:30px;text-decoration:none}
.post-nav-bottom a:hover{background:var(--gold-soft);border-color:var(--green)}

/* Footer */
footer{background:var(--surface);padding:42px 0 30px;border-top:1px solid var(--border);text-align:center}
.foot-sign .sign-name{font-family:'Playfair Display',serif;font-style:italic;font-size:1.4rem;font-weight:700;color:var(--green-dark);display:block;margin-bottom:6px}
.foot-copy{font-size:0.86rem;color:var(--text-muted);margin-top:8px;font-weight:500}

@media(max-width:640px){body{font-size:17.5px}.post-wrap{padding:34px 20px 62px}.post-body{font-size:1.08rem}}