/* ============================================================
   BÀI VIẾT CHUYÊN SÂU /sinh-trac/ · khuôn dùng chung cho 60 bài
   Nạp SAU sinh-trac.css, dùng lại biến màu và lớp song ngữ .v/.e
   Soạn 29/09/2026
   ============================================================ */
.bv-dau{background:radial-gradient(ellipse at 15% 0%,#7E1410 0%,var(--tham) 55%,#2E0603 100%);color:var(--kem);padding:30px 0 34px}
.bv-dau .st-wrap{max-width:860px}
.bv-duong{font-size:.82rem;margin:0 0 14px;color:#E8D49A}
.bv-duong a{color:#FFE7A8;text-decoration:none}
.bv-duong a:hover{text-decoration:underline}
.bv-duong .sep{margin:0 6px;opacity:.7}
.bv-dau h1{font-family:"Noto Serif",Georgia,serif;font-size:clamp(1.55rem,4.2vw,2.35rem);line-height:1.28;margin:0 0 12px;color:#fff}
.bv-dau .bv-sub{font-size:1.02rem;color:#F5E6C0;margin:0 0 16px;max-width:760px}
.bv-meta{display:flex;flex-wrap:wrap;gap:8px 16px;font-size:.84rem;color:#E8D49A;align-items:center}
.bv-meta b{color:#FFD76A}
.bv-meta .uk-ico{width:1.05em;height:1.05em;vertical-align:-2px}

.bv-khung{max-width:1120px;margin:0 auto;padding:26px 18px 10px;display:grid;grid-template-columns:minmax(0,1fr);gap:28px}
@media (min-width:1000px){.bv-khung{grid-template-columns:250px minmax(0,1fr)}}
.bv-muc{align-self:start}
@media (min-width:1000px){.bv-muc{position:sticky;top:66px;max-height:calc(100vh - 86px);overflow:auto}}
.bv-muc details{background:#fff;border:1px solid var(--vien);border-radius:14px;padding:12px 14px}
.bv-muc summary{font-weight:800;color:var(--tham);cursor:pointer;font-size:.92rem}
.bv-muc ol{margin:10px 0 0;padding:0;list-style:none;counter-reset:m;font-size:.88rem;line-height:1.45}
.bv-muc li{counter-increment:m;margin:0 0 8px;display:flex;gap:8px}
.bv-muc li::before{content:counter(m);flex:0 0 22px;height:22px;border-radius:50%;background:var(--kem);color:var(--tham);font-weight:800;font-size:.74rem;display:flex;align-items:center;justify-content:center}
.bv-muc a{color:var(--chu);text-decoration:none}
.bv-muc a.on,.bv-muc a:hover{color:var(--son)}

.bv-than{min-width:0;max-width:780px;font-size:1.04rem}
.bv-than>section{padding:0;margin:0 0 34px;scroll-margin-top:66px}
.bv-than h2{text-align:left;font-size:clamp(1.3rem,3vw,1.7rem);margin:0 0 12px}
.bv-than h3{margin:22px 0 8px}
.bv-than p{margin:0 0 14px}
.bv-than a{color:var(--son2)}
.bv-than ul.bv-ds,.bv-than ol.bv-ds{margin:0 0 16px;padding-left:1.3em}
.bv-than ul.bv-ds li,.bv-than ol.bv-ds li{margin:0 0 6px;list-style:revert}

.bv-tl{background:#fff;border:1.5px solid var(--dong);border-left:6px solid var(--son);border-radius:14px;padding:16px 18px;margin:0 0 26px;font-size:1.05rem}
.bv-tl b.t{display:block;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--dong);margin-bottom:4px}

.bv-hinh{background:#fff;border:1px solid var(--vien);border-radius:16px;padding:14px;margin:6px 0 22px}
.bv-hinh svg{display:block;width:100%;height:auto}
.bv-hinh figcaption{font-size:.86rem;color:var(--nhat);margin-top:8px;line-height:1.5}
.bv-hinh figcaption b{color:var(--tham)}
.bv-hinh.hep{max-width:520px;margin-left:auto;margin-right:auto}
.bv-hinh.nho{max-width:380px}

.bv-bang{overflow-x:auto;margin:0 0 20px;border:1px solid var(--vien);border-radius:14px;background:#fff}
.bv-bang table{min-width:520px}
.bv-bang caption{caption-side:top;text-align:left;font-weight:800;color:var(--tham);padding:12px 14px 4px;font-size:.92rem}
.bv-bang th,.bv-bang td{padding:9px 12px;border-bottom:1px solid #F0E6CF;text-align:left;vertical-align:top}
.bv-bang thead th{background:var(--tham);color:var(--kem);font-size:.84rem}
.bv-bang tbody tr:nth-child(even){background:#FFFBF0}

.bv-moc{list-style:none;margin:0 0 22px;padding:0;border-left:3px solid var(--dong);position:relative}
.bv-moc li{position:relative;padding:0 0 16px 22px}
.bv-moc li::before{content:"";position:absolute;left:-1.5px;top:4px;width:17px;height:17px;box-sizing:border-box;transform:translateX(-50%);border-radius:50%;background:var(--kem2);border:3px solid var(--son)}
.bv-moc .nam{display:inline-block;font-weight:800;color:#fff;background:var(--tham);border-radius:8px;padding:1px 9px;font-size:.84rem;margin-right:6px}
.bv-moc b.ai{color:var(--tham)}

.bv-luoi{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:0 0 22px}
.bv-luoi a,.bv-luoi div{background:#fff;border:1px solid var(--vien);border-radius:14px;padding:10px;text-align:center;text-decoration:none;color:var(--chu);font-size:.86rem;line-height:1.35}
.bv-luoi svg{width:100%;max-width:96px;height:auto;display:block;margin:0 auto 6px}
.bv-luoi b{display:block;color:var(--tham)}

.bv-thay{background:#FFF6F3;border:1.5px solid var(--son);border-radius:14px;padding:16px 18px;margin:0 0 22px}
.bv-kh{background:#fff;border:1.5px solid var(--hung);border-radius:14px;padding:16px 18px;margin:0 0 22px}
.bv-thay b.t,.bv-kh b.t{display:block;font-family:"Noto Serif",Georgia,serif;font-size:1.02rem;margin-bottom:6px}
.bv-thay b.t{color:var(--son)}
.bv-kh b.t{color:var(--hung)}
.bv-thay p:last-child,.bv-kh p:last-child{margin-bottom:0}

.bv-cta{background:radial-gradient(ellipse at 20% 0%,#7E1410 0%,var(--tham) 60%,#2E0603 100%);color:var(--kem);border-radius:18px;padding:22px 20px;margin:10px 0 30px;text-align:center}
.bv-cta h2{color:#FFD76A;text-align:center;margin-bottom:6px}
.bv-cta p{color:#F5E6C0;margin:0 auto 14px;max-width:560px}
.bv-cta .hang{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.bv-cta a.phu{display:inline-flex;align-items:center;gap:6px;border:1.5px solid #E8C774;color:#FFE7A8;border-radius:999px;padding:10px 18px;font-weight:700;text-decoration:none}

.bv-hoi details{background:#fff;border:1px solid var(--vien);border-radius:12px;padding:12px 16px;margin-bottom:10px}
.bv-hoi summary{font-weight:700;color:var(--tham);cursor:pointer}
.bv-hoi details p{margin:10px 0 0}

.bv-nguon ol{padding-left:1.4em;font-size:.9rem;color:var(--nhat)}
.bv-nguon li{margin-bottom:6px;list-style:revert}
.bv-nguon a{color:var(--son2);word-break:break-word}

.bv-lien{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:0 0 20px}
.bv-lien a{display:block;background:#fff;border:1px solid var(--vien);border-radius:14px;padding:12px 14px;text-decoration:none;color:var(--chu)}
.bv-lien a b{display:block;color:var(--tham);margin-bottom:2px}
.bv-lien a small{color:var(--nhat)}

@media (max-width:520px){
  .bv-than{font-size:1rem}
  .bv-hinh{padding:10px;border-radius:14px}
  .bv-khung{padding:18px 14px 6px}
}