/* © 2026 UK MASTER CORP · Kiểu chung của cụm Sinh Lý Nam Nữ */
:root{
  --nen:#F2F7F9;--giay:#FFFFFF;--vien:#C4DBE2;--muc:#0E2A35;--muc2:#48626E;
  --dam:#06232E;--dam2:#0B3442;--ngoc:#128C80;--ngoc-s:#7CEEE2;--thuy:#0B5C9E;--thuy-n:#DCEBF8;
  --vang:#A8771C;--son:#A63A2C;--son-n:#FBEAE6;
  --f-chu:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-tieu:"Source Serif 4",Georgia,"Times New Roman",serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --bong:0 10px 30px rgba(6,35,46,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--nen);color:var(--muc);font-family:var(--f-chu);font-size:16.5px;line-height:1.65}
a{color:var(--thuy)}
.an{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Thanh đầu trang */
.sl-nav{position:sticky;top:0;z-index:60;background:linear-gradient(180deg,#072A37,#051F29);color:#EDF7FA;border-bottom:1px solid rgba(124,238,226,.22);box-shadow:0 4px 18px rgba(4,20,28,.22)}
.sl-nav-in{max-width:1180px;margin:0 auto;padding:9px 18px;display:flex;align-items:center;gap:18px}
.sl-hieu{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff;flex:none}
.sl-dau{width:47px;height:36px;flex:none}
.sl-hieu b{display:block;font-family:var(--f-tieu);font-size:15.5px;letter-spacing:.09em;white-space:nowrap}
.sl-hieu i{display:block;font-style:normal;font-size:10px;letter-spacing:.09em;color:var(--ngoc-s);text-transform:uppercase;font-weight:700;white-space:nowrap;margin-top:2px}
.sl-muc{display:flex;gap:16px;flex:1;min-width:0;overflow-x:auto;white-space:nowrap;scrollbar-width:none}
.sl-muc::-webkit-scrollbar{display:none}
.sl-muc a{color:rgba(237,247,250,.84);text-decoration:none;font-size:14px;font-weight:600;padding:6px 0;border-bottom:2px solid transparent}
.sl-muc a:hover,.sl-muc a.on{color:#fff;border-bottom-color:var(--ngoc-s)}
.sl-ve{flex:none;color:rgba(237,247,250,.84);font-size:13px;font-weight:600;text-decoration:none;border:1px solid rgba(124,238,226,.3);border-radius:999px;padding:5px 12px;white-space:nowrap}

.vo{max-width:1180px;margin:0 auto;padding:0 18px}
.duong-dan{font-size:13.5px;color:var(--muc2);padding:16px 0 0}
.duong-dan a{color:var(--muc2)}
.dau-bai{padding:14px 0 6px;max-width:860px}
.chip{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--thuy);background:var(--thuy-n);border-radius:999px;padding:5px 12px}
h1{font-family:var(--f-tieu);font-size:clamp(30px,5vw,44px);line-height:1.12;margin:12px 0 10px;color:var(--dam)}
.sapo{font-size:18px;color:var(--muc);margin:0 0 14px}
.ghi{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:13.5px;color:var(--muc2);margin:0 0 16px}
.tcbt-geo{list-style:none;margin:0 0 6px;padding:14px 16px;background:var(--giay);border:1px solid var(--vien);border-left:4px solid var(--thuy);border-radius:0 14px 14px 0;font-size:15.5px;display:grid;gap:6px}
.tcbt-geo li{padding-left:22px;position:relative}
.tcbt-geo li::before{content:"";position:absolute;left:4px;top:.62em;width:7px;height:7px;border-radius:50%;background:var(--ngoc)}

.bai{display:grid;grid-template-columns:210px minmax(0,1fr);gap:40px;padding:22px 0 40px}
.muc-luc{position:sticky;top:76px;align-self:start;font-size:14.5px}
.muc-luc b{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muc2);margin-bottom:6px}
.muc-luc ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--vien)}
.muc-luc a{display:block;padding:5px 0 5px 12px;margin-left:-2px;border-left:2px solid transparent;color:var(--muc2);text-decoration:none}
.muc-luc a:hover{color:var(--dam);border-left-color:var(--ngoc)}
.noi{max-width:800px;min-width:0}
.noi section{scroll-margin-top:78px;margin-bottom:38px}
h2{font-family:var(--f-tieu);font-size:27px;line-height:1.18;color:var(--dam);margin:0 0 10px}
h3{font-size:17.5px;margin:20px 0 6px;color:var(--dam)}
.noi p{margin:0 0 12px}
.noi ul,.noi ol{margin:0 0 12px;padding-left:22px}
.noi li{margin-bottom:5px}
.the{background:var(--giay);border:1px solid var(--vien);border-radius:18px;padding:18px;box-shadow:var(--bong)}
.luu-y{background:var(--son-n);border:1px solid #E7B9AF;border-left:4px solid var(--son);border-radius:0 14px 14px 0;padding:13px 16px;margin:0 0 12px}
.luu-y b{color:var(--son)}
.hai-cot{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.o{background:var(--giay);border:1px solid var(--vien);border-radius:14px;padding:14px 16px}
.o h3{margin-top:0}
.o p:last-child,.o ul:last-child{margin-bottom:0}
.o.dong{border-top:4px solid var(--vang)}
.o.tay{border-top:4px solid var(--thuy)}

/* Sơ đồ */
.so-do{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:18px;align-items:center}
.so-do svg{width:100%;height:auto;display:block}
.chu-giai{list-style:none;margin:0;padding:0;display:grid;gap:7px;font-size:15px}
.chu-giai li{display:grid;grid-template-columns:26px 1fr;gap:9px;align-items:start;margin:0}
.chu-giai i{font-style:normal;width:24px;height:24px;border-radius:50%;background:var(--dam);color:#fff;font:700 12.5px/24px var(--f-chu);text-align:center;margin-top:1px}
.chu-giai li.chinh i{background:var(--ngoc)}
.chu-giai span b{color:var(--dam)}
.sd-bang{transition:transform .9s ease, stroke .9s ease;transform-box:fill-box;transform-origin:50% 0}
.sd-mui{opacity:0;transition:opacity .5s ease}
.dang-co .sd-bang{transform:translateY(-10px) scaleY(.72);stroke:#0E7468}
.dang-co .sd-mui{opacity:1}
.sd-so7{transition:transform .9s ease}
.dang-co .sd-so7{transform:translateY(-18px)}
.sd-thu{margin:12px 0 0;display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:14px;color:var(--muc2)}
.nut{font:700 14.5px var(--f-chu);border-radius:999px;padding:9px 18px;border:1px solid var(--vien);background:var(--giay);color:var(--dam);cursor:pointer}
.nut:hover{border-color:var(--ngoc)}
.nut:focus-visible,.dn-muc button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--ngoc-s);outline-offset:2px}

/* Bộ đếm nhịp */
.dem{background:linear-gradient(160deg,#07303E,#051F29);color:#EDF7FA;border-radius:22px;padding:22px;box-shadow:0 18px 40px rgba(6,35,46,.25);margin:18px 0 22px}
.dn-muc{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:0 0 18px}
.dn-muc button{font-family:var(--f-chu);background:rgba(255,255,255,.06);border:1px solid rgba(124,238,226,.25);color:#EDF7FA;border-radius:14px;padding:9px 6px;cursor:pointer;text-align:center;line-height:1.25}
.dn-muc button b{display:block;font-size:14px}
.dn-muc button span{display:block;font-size:12px;color:rgba(237,247,250,.72)}
.dn-muc button[aria-pressed="true"]{background:var(--ngoc-s);border-color:var(--ngoc-s);color:var(--dam)}
.dn-muc button[aria-pressed="true"] span{color:var(--dam2)}
.dn-than{display:grid;grid-template-columns:230px minmax(0,1fr);gap:22px;align-items:center}
.dn-vong{position:relative;width:230px;height:230px;margin:0 auto}
.dn-vong svg{width:100%;height:100%;transform:rotate(-90deg)}
.dn-nen{fill:none;stroke:rgba(255,255,255,.1);stroke-width:14}
.dn-chay{fill:none;stroke:var(--ngoc-s);stroke-width:14;stroke-linecap:round;stroke-dasharray:603.2;stroke-dashoffset:603.2}
.dn-giua{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:34px}
.dn-pha{font-size:15px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--ngoc-s)}
.dn-so{font:700 68px/1 var(--f-mono);margin:4px 0 2px}
.dn-goi{font-size:13px;color:rgba(237,247,250,.78);line-height:1.35;max-width:140px}
.dn-ben h3{color:#fff;margin:0 0 4px;font-size:18px}
.dn-ben p{margin:0 0 12px;color:rgba(237,247,250,.82);font-size:15px}
.dn-dong{display:flex;justify-content:space-between;gap:10px;font-size:14.5px;padding:8px 0;border-top:1px solid rgba(255,255,255,.1)}
.dn-dong b{font-family:var(--f-mono);font-size:15px}
.dn-cham{display:inline-flex;gap:6px;vertical-align:middle;margin-right:8px}
.dn-cham i{width:13px;height:13px;border-radius:50%;border:2px solid var(--ngoc-s)}
.dn-cham i.co{background:var(--ngoc-s)}
.dn-nut{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.dn-nut .nut{background:transparent;color:#EDF7FA;border-color:rgba(124,238,226,.35)}
.dn-nut .nut.chinh{background:var(--ngoc-s);border-color:var(--ngoc-s);color:var(--dam)}
.dn-nut .nut[aria-pressed="true"]{background:rgba(124,238,226,.16)}

/* Tư thế */
.tu-the{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.tu-the figure{margin:0;background:var(--giay);border:1px solid var(--vien);border-radius:14px;padding:12px;text-align:center}
.tu-the svg{width:100%;max-width:190px;height:auto}
.tu-the figcaption{font-size:14.5px;margin-top:4px}
.tu-the figcaption b{display:block;color:var(--dam)}
.tt-net{fill:none;stroke:var(--dam);stroke-width:5;stroke-linecap:round;stroke-linejoin:round}
.tt-nen{stroke:var(--vien);stroke-width:4;stroke-linecap:round}

/* Bảng */
.cuon{overflow-x:auto;border:1px solid var(--vien);border-radius:14px;background:var(--giay)}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:15px}
caption{caption-side:top;text-align:left;font-weight:700;padding:12px 14px 8px;color:var(--dam)}
th,td{padding:10px 14px;text-align:left;border-top:1px solid var(--vien);vertical-align:top}
thead th{background:#EAF3F6;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muc2)}
tbody th{color:var(--dam);white-space:nowrap}

details{background:var(--giay);border:1px solid var(--vien);border-radius:12px;padding:0 16px;margin-bottom:8px}
summary{cursor:pointer;font-weight:700;padding:13px 0;color:var(--dam)}
details p{margin:0 0 14px}
.nguon{font-size:14.5px}
.nguon li{margin-bottom:8px}
.tuyen-bo{font-size:14.5px;color:var(--muc2);background:#EAF3F6;border-radius:14px;padding:14px 16px}
.chan{background:var(--dam);color:rgba(237,247,250,.8);font-size:13.5px;padding:22px 18px;text-align:center}
.chan a{color:var(--ngoc-s)}

/* Thẻ bài, trang tổng */
.luoi{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.the-bai{display:block;background:var(--giay);border:1px solid var(--vien);border-radius:14px;padding:14px 16px;text-decoration:none;color:var(--muc);transition:border-color .2s,box-shadow .2s;min-width:0}
.the-bai:hover{border-color:var(--ngoc);box-shadow:var(--bong)}
.the-bai span{display:block;font-size:11.5px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--thuy);margin-bottom:3px}
.the-bai b{display:block;color:var(--dam);font-size:16.5px;line-height:1.3}
.the-bai i{display:block;font-style:normal;font-size:14.5px;color:var(--muc2);margin-top:4px;line-height:1.45}
.tong{padding:22px 0 40px}
.tong section{scroll-margin-top:78px;margin-bottom:34px}
.mo-nhom{margin:0 0 12px;color:var(--muc2)}
.dn-muc-2{grid-template-columns:repeat(2,1fr)}
.dn-muc-3{grid-template-columns:repeat(3,1fr)}
.noi td a,.noi th a{white-space:normal}

@media (max-width:900px){
  .bai{grid-template-columns:minmax(0,1fr);gap:18px;padding-top:16px}
  .muc-luc{position:static;min-width:0}
  .muc-luc ol{display:flex;gap:6px;overflow-x:auto;border:0;padding-bottom:4px;scrollbar-width:none}
  .muc-luc ol::-webkit-scrollbar{display:none}
  .muc-luc a{white-space:nowrap;border:1px solid var(--vien);border-radius:999px;padding:5px 12px;margin:0;background:var(--giay)}
  .muc-luc a:hover{border-color:var(--ngoc)}
  .sl-ve{display:none}
}
@media (max-width:640px){
  body{font-size:16px}
  .sl-nav-in{gap:12px;padding:8px 14px}
  .sl-hieu i{display:none}
  .vo{padding:0 14px}
  .so-do,.hai-cot,.dn-than{grid-template-columns:minmax(0,1fr)}
  .dn-muc,.dn-muc-3{grid-template-columns:repeat(2,1fr)}
  .dem{padding:16px}
  .tu-the{grid-template-columns:minmax(0,1fr)}
  .tu-the figure{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;align-items:center;text-align:left}
  h2{font-size:24px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .sd-bang,.sd-mui,.sd-so7{transition:none}
}