/* ===== Bài 4 — Tăng tàn 6–13 và Bất định (dùng chung bai-1.css, bai-2.css, bai-3.css) ===== */

/* các bước khuyến cáo (điều 10–13) */
.b4k{margin:10px 0 14px;padding:14px;border-radius:18px;background:color-mix(in srgb,var(--c) 6%,var(--card));border:1px solid color-mix(in srgb,var(--c) 25%,var(--line))}
.b4k-list{margin:0;padding:0;display:grid;gap:6px;counter-reset:k}
.b4k-list li{list-style:none;counter-increment:k;display:grid;grid-template-columns:30px minmax(0,1fr) auto;column-gap:10px;align-items:center;padding:8px 12px;border-radius:12px;background:var(--card);border:1px solid var(--line);transition:opacity .2s,border-color .2s,background .2s}
.b4k-list li::before{content:counter(k);grid-row:span 2;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:.85rem;color:var(--muted);background:color-mix(in srgb,var(--muted) 14%,var(--card))}
.b4k-list li b{font-size:.95rem;line-height:1.3}
.b4k-list li span{grid-column:2;font-size:.84rem;color:var(--muted);line-height:1.4}
.b4k-list li em{grid-column:3;grid-row:1 / span 2;font-style:normal;margin:0}
.b4k-list li.next{opacity:.5}
.b4k-list li.now{border-color:var(--c);background:color-mix(in srgb,var(--c) 10%,var(--card));box-shadow:0 2px 10px color-mix(in srgb,var(--c) 20%,transparent)}
.b4k-list li.now::before{color:#fff;background:var(--c)}
.b4k-list li.past::before{color:var(--c);background:color-mix(in srgb,var(--c) 18%,var(--card))}
.b4k-out{margin-top:10px;padding:10px 14px;border-radius:12px;background:var(--card);border:1px solid var(--line);font-size:.95rem}
.b4k-out .vd{font-size:.78rem}
.b4k-btn{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
@media(max-width:560px){.b4k-list li{grid-template-columns:28px minmax(0,1fr)}.b4k-list li em{grid-column:2;grid-row:auto;justify-self:start;margin-top:4px}}

/* ===== Điều 6–7: phân tích đầy đủ (39 đoạn), máy tính tội (2026-10-30) ===== */
.stg.s3{grid-template-columns:repeat(3,minmax(0,1fr))}
.stg.s4{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:640px){.stg.s3,.stg.s4{grid-template-columns:minmax(0,1fr)}}
.stg b .vd{margin:0 0 0 4px}
.g5{--gc:var(--c2)}.g6{--gc:var(--c8)}.g7{--gc:var(--c6)}.g8{--gc:var(--ok)}
.k39-h{margin:18px 0 6px;font-size:.93rem;line-height:1.55}
.k39 summary .g{display:none}
.k39-h b{font-family:var(--serif);font-size-adjust:.5;font-size:1.05rem;margin:0 3px}
.k39 .a .src{font-size:.8rem;color:var(--muted);margin:-2px 0 8px}
ul.kq{list-style:none;margin:6px 0 10px;padding:0;display:grid;gap:4px}
ul.kq li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:4px 10px;margin:0;padding:6px 10px;border-radius:10px;background:color-mix(in srgb,var(--line) 35%,var(--card));font-size:.88rem;line-height:1.4}
.kq-l{flex:1 1 210px;min-width:0}
.kq-r{flex:none;display:inline-flex;flex-wrap:wrap;gap:4px;align-items:center}
.kq-r .vd{margin:0}
.kq-r .ai{color:var(--muted);font-size:.78rem;margin-right:2px}
.lech{color:var(--no);font-weight:800;margin-left:2px;cursor:help}
.kq-6{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:2px 14px}
.kq-k>b{display:block;font-size:.88rem;margin:6px 0 0;color:var(--c,var(--acc))}
.lech-note{margin:4px 0 10px;padding:8px 12px;border-radius:10px;font-size:.86rem;line-height:1.5;background:color-mix(in srgb,var(--no) 8%,var(--card));border-left:4px solid var(--no)}
.lech-note ul{margin:4px 0 0;padding-left:18px}
.lech-note li{margin:3px 0}
.k24 details.nv{margin:4px 0 8px;border:1px dashed var(--line);border-radius:10px;background:none}
.k24 details.nv>summary{padding:6px 10px;font-size:.86rem;font-weight:700;color:var(--acc)}
.k24 details.nv .iv{padding:0 10px}
.k24 details.nv .src{padding:0 10px}
/* máy tính tội */
.b4c{margin:10px 0 16px;padding:10px 14px 14px;border-radius:18px;background:color-mix(in srgb,var(--c) 6%,var(--card));border:1px solid color-mix(in srgb,var(--c) 25%,var(--line))}
.b4c-row{display:grid;grid-template-columns:150px minmax(0,1fr);gap:6px 12px;align-items:start;padding:8px 0;border-top:1px dashed var(--line)}
.b4c-row:first-child{border-top:0}
.b4c-row[hidden]{display:none}
.b4c-l{font-weight:700;font-size:.9rem;padding-top:7px}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{flex:1 1 auto;padding:7px 12px;border-radius:12px;border:1.5px solid var(--line);background:var(--card);font:inherit;font-size:.88rem;line-height:1.3;color:inherit;cursor:pointer;text-align:center}
.seg.col{flex-direction:column}
.seg.col button{text-align:left}
.seg button[aria-pressed="true"]{border-color:var(--c);background:color-mix(in srgb,var(--c) 13%,var(--card));font-weight:700}
.b4c-out{margin-top:10px;padding:12px 14px;border-radius:13px;background:var(--card);border-left:5px solid var(--ok);font-size:.95rem;line-height:1.55}
.b4c-out.ss{border-left-color:var(--c3)}.b4c-out.dk{border-left-color:var(--c6)}
.b4c-out p{margin:4px 0}
.b4c-out .big{font-family:var(--serif);font-size-adjust:.5;font-size:1.12rem}
.b4c-out .big .vd{vertical-align:.15em}
.b4c-out .ref{font-size:.86rem;color:var(--muted)}
@media(max-width:560px){.b4c-row{grid-template-columns:minmax(0,1fr)}.b4c-l{padding-top:0}}