/* Trang «Tinh bàn Huyền Không» — dùng token màu của bộ CSS chung Viện (--lacquer, --gold, --paper…), mọi lớp mang tiền tố tbhk. */
.tbhk{--tb-son:#C0392B;--tb-son-nen:#FBEAE7;--tb-huong:#1D5FC4;--tb-huong-nen:#E5EEFB;--tb-van:#3D3F91;--tb-o:clamp(66px,19vw,104px);--tb-vong:clamp(44px,11vw,64px)}
.tbhk .tbhk-luoi{display:grid;grid-template-columns:minmax(0,370px) minmax(0,1fr);gap:32px;align-items:start}
.tbhk .tbhk-the{background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--lacquer);padding:28px 28px 26px;box-shadow:0 14px 34px rgba(31,20,16,.07)}
.tbhk h2{font-family:'Noto Serif',Georgia,serif;font-weight:600;color:var(--ink);margin:0}
.tbhk .tbhk-nhap h2{font-size:22px;margin-bottom:6px}
.tbhk .tbhk-nhap .mo-ta{font-size:14.5px;color:var(--mut);margin:0 0 20px;line-height:1.6}
.tbhk .truong{display:flex;flex-direction:column;gap:7px;margin-bottom:20px}
.tbhk label{font-size:12.5px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--lacquer)}
.tbhk .o-nhap{position:relative}
.tbhk input,.tbhk select{width:100%;font:inherit;font-size:18px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:2px;padding:12px 14px;min-height:50px}
.tbhk select{font-size:16px}
.tbhk input[aria-invalid="true"]{border-color:var(--tb-son);background:#FFF8F6}
.tbhk .o-nhap .don-vi{position:absolute;right:14px;top:50%;transform:translateY(-50%);color:var(--mut);font-size:18px;pointer-events:none}
.tbhk input:focus-visible,.tbhk select:focus-visible,.tbhk button:focus-visible,.tbhk a:focus-visible{outline:2px solid var(--gold-bright);outline-offset:2px}
.tbhk .goi-y{font-size:13.5px;color:var(--mut);line-height:1.5}
.tbhk .hoac{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--mut);margin:-6px 0 12px}
.tbhk .hoac::before,.tbhk .hoac::after{content:"";flex:1;border-top:1px solid var(--line)}
.tbhk .nut-lap{width:100%;font:inherit;font-size:16px;font-weight:600;letter-spacing:.04em;color:var(--cream);background:linear-gradient(157deg,var(--lacquer-2),var(--lacquer) 55%,var(--lacquer-3));border:1px solid rgba(212,175,55,.45);padding:14px 18px;cursor:pointer;transition:transform .15s,box-shadow .15s}
.tbhk .nut-lap:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(92,14,14,.25)}
.tbhk .loi{margin:14px 0 0;font-size:14px;color:var(--tb-son)}
.tbhk .vi-du{margin:14px 0 0;font-size:13px;color:var(--mut);font-style:italic}

.tbhk .tbhk-ket-qua{transition:opacity .2s}
.tbhk .tbhk-ket-qua.mo{opacity:.35}
.tbhk .tbhk-dau-kq{display:flex;gap:20px;align-items:center;padding-bottom:18px;border-bottom:1px solid var(--line)}
.tbhk .tbhk-van{flex:none;width:96px;height:96px;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(157deg,var(--lacquer-2),var(--lacquer) 55%,var(--lacquer-3));color:var(--cream);border:1px solid rgba(212,175,55,.5);box-shadow:inset 0 0 0 4px var(--lacquer),inset 0 0 0 5px rgba(232,199,107,.5)}
.tbhk .tbhk-van span{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-bright-2)}
.tbhk .tbhk-van b{font-family:'Noto Serif',Georgia,serif;font-size:40px;line-height:1;color:#fff}
.tbhk .tbhk-van small{font-size:11px;color:var(--cream-2);margin-top:2px;font-variant-numeric:tabular-nums}
.tbhk .tbhk-dau-kq h2{font-size:clamp(22px,3vw,28px);line-height:1.2}
.tbhk .tbhk-dau-kq p{margin:6px 0 0;font-size:15px;color:var(--body);line-height:1.6}
.tbhk .tbhk-canh{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.tbhk .tbhk-canh li{font-size:14.5px;line-height:1.55;background:#FFF5E1;border-left:3px solid var(--gold-bright);padding:10px 14px;color:var(--ink-2)}

/* bàn: lưới 5×5, bàn 3×3 ở giữa, tên phương ở vòng ngoài, bốn góc ở bốn góc chéo */
.tbhk .tbhk-khung{display:grid;grid-template-columns:var(--tb-vong) repeat(3,var(--tb-o)) var(--tb-vong);grid-template-rows:calc(var(--tb-vong)*.62) repeat(3,var(--tb-o)) calc(var(--tb-vong)*.62);justify-content:center;margin:22px auto 6px;max-width:100%}
.tbhk .tbhk-luoi-ban{grid-row:2/5;grid-column:2/5;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);border:2px solid var(--ink)}
.tbhk .tbhk-o{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1.5fr;align-items:center;justify-items:center;padding:4px 2px 8px;border:1px solid var(--line);background:#fff;font-family:'Noto Serif',Georgia,serif;font-variant-numeric:tabular-nums lining-nums}
.tbhk .tbhk-o.giua{background:#F3ECDD}
.tbhk .tbhk-o.la-huong{background:var(--tb-huong-nen)}
.tbhk .tbhk-o.la-toa{background:var(--tb-son-nen)}
.tbhk .so-van{grid-column:1/-1;align-self:end;font-size:calc(var(--tb-o)*.17);font-weight:700;color:var(--tb-van);line-height:1}
.tbhk .so-son,.tbhk .so-huong{font-size:calc(var(--tb-o)*.31);font-weight:700;line-height:1;width:1.32em;height:1.32em;display:grid;place-items:center;border-radius:50%}
.tbhk .so-son{color:var(--tb-son)}
.tbhk .so-huong{color:var(--tb-huong)}
.tbhk .so-son.vuong{box-shadow:inset 0 0 0 2px var(--tb-son)}
.tbhk .so-huong.vuong{box-shadow:inset 0 0 0 2px var(--tb-huong)}
.tbhk .tbhk-nhan{display:flex;font-size:14px;color:var(--mut);line-height:1.15;padding:3px}
.tbhk .tbhk-nhan.h1{align-items:flex-end}.tbhk .tbhk-nhan.h5{align-items:flex-start}.tbhk .tbhk-nhan.h3{align-items:center}
.tbhk .tbhk-nhan.c1{justify-content:flex-end;text-align:right}.tbhk .tbhk-nhan.c5{justify-content:flex-start;text-align:left}.tbhk .tbhk-nhan.c3{justify-content:center;text-align:center}
.tbhk .tbhk-nhan.goc{font-size:13px}
.tbhk .nhan-huong{color:var(--tb-huong);font-weight:700;font-size:15px}
.tbhk .nhan-toa{color:var(--tb-son);font-weight:700;font-size:15px}
.tbhk .tbhk-chu-giai{list-style:none;margin:16px 0 0;padding:14px 0 0;border-top:1px dashed var(--line);display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13.5px;color:var(--mut)}
.tbhk .tbhk-chu-giai i{font-style:normal;font-weight:600;color:var(--ink-2)}
.tbhk .tbhk-chu-giai .cg-van{color:var(--tb-van)}.tbhk .tbhk-chu-giai .cg-son{color:var(--tb-son)}.tbhk .tbhk-chu-giai .cg-huong{color:var(--tb-huong)}
.tbhk .tbhk-chu-giai .cg-nen-huong{background:var(--tb-huong-nen);padding:0 5px}.tbhk .tbhk-chu-giai .cg-nen-toa{background:var(--tb-son-nen);padding:0 5px}

/* phần bài dưới công cụ: hướng dẫn, đọc bàn, bảng tra, hỏi đáp */
.tbhk-bai .s-head{text-align:center;margin-bottom:40px}
.tbhk .tbhk-buoc{list-style:none;counter-reset:buoc;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.tbhk .tbhk-buoc li{counter-increment:buoc;position:relative;background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--lacquer);padding:62px 24px 24px}
.tbhk .tbhk-buoc li::before{content:counter(buoc);position:absolute;top:18px;left:24px;font-family:'Noto Serif',Georgia,serif;font-size:32px;font-weight:600;line-height:1;color:var(--lacquer)}
.tbhk .tbhk-buoc b{display:block;font-family:'Noto Serif',Georgia,serif;font-size:19px;font-weight:600;color:var(--ink);margin-bottom:8px}
.tbhk .tbhk-buoc p{margin:0;font-size:15px;line-height:1.7;color:var(--body)}
.tbhk .tbhk-hai-cot{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px;align-items:start}
.tbhk .tbhk-muc h3{font-family:'Noto Serif',Georgia,serif;font-size:22px;font-weight:600;color:var(--ink);margin:0 0 12px;line-height:1.3}
.tbhk .tbhk-muc p{font-size:15.5px;line-height:1.75;color:var(--body);margin:0 0 16px}
.tbhk .tbhk-muc a,.tbhk .faq-item a{color:var(--lacquer);font-weight:600;text-decoration:underline}
.tbhk .tbhk-ba-sao{margin:0 0 18px;display:flex;flex-direction:column;gap:12px}
.tbhk .tbhk-ba-sao div{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--tb-van);padding:12px 16px}
.tbhk .tbhk-ba-sao .sao-son{border-left-color:var(--tb-son)}
.tbhk .tbhk-ba-sao .sao-huong{border-left-color:var(--tb-huong)}
.tbhk .tbhk-ba-sao dt{font-weight:700;font-size:15px;color:var(--tb-van);margin-bottom:4px}
.tbhk .tbhk-ba-sao .sao-son dt{color:var(--tb-son)}
.tbhk .tbhk-ba-sao .sao-huong dt{color:var(--tb-huong)}
.tbhk .tbhk-ba-sao dd{margin:0;font-size:14.5px;line-height:1.65;color:var(--body)}
.tbhk .tbhk-bang{width:100%;border-collapse:collapse;background:var(--paper);font-size:14.5px;line-height:1.5;font-variant-numeric:tabular-nums;margin:0}
.tbhk .tbhk-bang th,.tbhk .tbhk-bang td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top;color:var(--ink-2)}
.tbhk .tbhk-bang thead th{background:var(--bg-3);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--lacquer)}
.tbhk .tbhk-bang tbody th{font-weight:600;color:var(--ink);background:#FBF7EE}
.tbhk .tbhk-bang-son td:nth-child(3),.tbhk .tbhk-bang-son td:last-child{white-space:nowrap}
.tbhk .tbhk-bang tr.nay td{background:#FFF5E1;color:var(--ink);font-weight:700}
.tbhk .faq-list{max-width:840px;margin:0 auto;display:flex;flex-direction:column}
.tbhk .faq-item{background:var(--paper);border:1px solid var(--line);border-bottom-width:0}
.tbhk .faq-item:last-child{border-bottom-width:1px}
.tbhk .faq-item summary{list-style:none;padding:18px 22px;cursor:pointer;font-family:'Noto Serif',Georgia,serif;font-size:16px;color:var(--ink);font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:16px}
.tbhk .faq-item summary::-webkit-details-marker{display:none}
.tbhk .faq-item summary::after{content:"+";color:var(--gold);font-size:22px;font-weight:500}
.tbhk .faq-item[open] summary::after{content:"−"}
.tbhk .faq-item[open] summary{color:var(--lacquer);border-bottom:1px dashed var(--line)}
.tbhk .faq-item .answer{padding:14px 22px 20px;font-size:15px;color:var(--body);line-height:1.8}
.tbhk .faq-item .answer p{margin:0}

/* dải mời liên hệ */
.tbhk-cta{background:linear-gradient(157deg,#6A141A,var(--lacquer) 50%,var(--lacquer-3));color:var(--cream);padding:56px 0}
.tbhk-cta .wrap{display:flex;gap:32px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.tbhk-cta h2{font-family:'Noto Serif',Georgia,serif;font-size:clamp(24px,3vw,32px);font-weight:600;color:#fff;margin:0 0 8px}
.tbhk-cta h2 em{color:var(--gold-bright-2)}
.tbhk-cta p{margin:0;max-width:60ch;color:var(--cream-2);font-size:16px;line-height:1.65}
.tbhk-cta .hang-nut{display:flex;flex-wrap:wrap;gap:12px}
.tbhk-cta .nut{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:12px 24px;font-weight:600;letter-spacing:.03em;border:1px solid var(--gold-bright)}
.tbhk-cta .nut-chinh{background:var(--gold-bright);color:var(--lacquer-3)}
.tbhk-cta .nut-chinh:hover{background:var(--gold-bright-2);color:var(--lacquer-3)}
.tbhk-cta .nut-phu{color:var(--gold-bright-2)}
.tbhk-cta .nut-phu:hover{background:rgba(232,199,107,.12);color:#fff}

@media (max-width:900px){
  .tbhk .tbhk-luoi{grid-template-columns:minmax(0,1fr);gap:22px}
  .tbhk .tbhk-the{padding:22px 18px}
  .tbhk .tbhk-van{width:80px;height:80px}
  .tbhk .tbhk-van b{font-size:34px}
  .tbhk .tbhk-nhan{font-size:12.5px}.tbhk .tbhk-nhan.goc{font-size:11.5px}
  .tbhk .nhan-huong,.tbhk .nhan-toa{font-size:13.5px}
  .tbhk .tbhk-buoc{grid-template-columns:minmax(0,1fr);gap:16px}
  .tbhk .tbhk-hai-cot{grid-template-columns:minmax(0,1fr);gap:44px}
  .tbhk .tbhk-bang{font-size:13.5px}
  .tbhk .tbhk-bang th,.tbhk .tbhk-bang td{padding:8px 9px}
}
@media (prefers-reduced-motion:reduce){.tbhk .nut-lap,.tbhk .tbhk-ket-qua{transition:none}}