/* Dr. Hạnh · giao diện chung. Gu Sephora + Dermstore chị Hạnh chọn (Zalo 30/10/2026): trắng, đen sắc, dễ xem, chất da liễu. Điểm nhấn hồng đất drhanh.vn. */
:root{
  --bg:#ffffff; --ink:#151314; --muted:#6b6264; --line:#e6dfdd; --soft:#f6f2f1;
  --rose:#be7c68; --rose-ink:#97573f; --on-ink:#ffffff; --cho:#fff3c4; --cho-ink:#6a5300;
  --ok:#2f6b4f; --warn:#8a5a00;
  --f-display:"Playfair Display","Didot","Times New Roman",serif;
  --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --w:1180px;
}
/* 08/11/2026: bỏ chế độ tối. Chị Hạnh chọn gu Sephora + Dermstore nền trắng, web luôn trắng dù máy khách để giao diện tối. Bản cũ: _nguon/_ban-cu-2026-11-08-truoc-bo-nen-toi/style.css */
:root{color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--bg)}
a{color:inherit}
img{max-width:100%;display:block}
h1,h2,h3{font-family:var(--f-display);font-weight:500;line-height:1.15;text-wrap:balance;margin:0}
p{margin:0}
:focus-visible{outline:2px solid var(--rose);outline-offset:3px}
.wrap{max-width:var(--w);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.hep{max-width:760px}
.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;font-weight:600;color:var(--rose-ink)}
.cho{background:var(--cho);color:var(--cho-ink);padding:0 .3em;border-radius:3px;font-weight:500;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.mono{font-family:var(--f-mono)}

/* Thanh duyệt + tiện ích + menu */
.duyet{background:var(--cho);color:var(--cho-ink);font-size:13px}
.duyet .wrap{padding-block:8px;text-align:center}
.util{background:var(--ink);color:var(--on-ink);font-size:13px}
.util .wrap{padding-block:9px;display:flex;justify-content:center;gap:8px 24px;flex-wrap:wrap;text-align:center}
.util a{text-decoration:none;border-bottom:1px solid color-mix(in srgb,var(--on-ink) 40%,transparent)}
header.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:9;background:var(--bg);border-bottom:1px solid var(--line)}
header.nav .wrap{display:flex;align-items:center;gap:20px;padding-block:14px}
.brand{display:flex;align-items:baseline;gap:9px;text-decoration:none;flex-shrink:0}
.brand .dr{font-family:var(--f-display);font-size:25px;font-weight:600}
.brand .ac{font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--muted);font-weight:600}
.menu{display:flex;gap:18px;margin-left:auto;font-size:14px;font-weight:500;flex-wrap:wrap}
.menu a{text-decoration:none;padding-block:4px;border-bottom:1.5px solid transparent;white-space:nowrap}
.menu a:hover,.menu a[aria-current="page"]{border-color:var(--ink)}
.nav-cta{flex-shrink:0}
.mo-menu{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:2px;padding:8px 10px;color:var(--ink);cursor:pointer;font:inherit;font-size:14px}
@media (max-width:1180px){
  .mo-menu{display:inline-flex;align-items:center;gap:6px}
  .menu{display:none;position:absolute;left:0;right:0;top:100%;background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px max(16px,env(safe-area-inset-right,0px)) 16px max(16px,env(safe-area-inset-left,0px))}
  .menu.mo{display:flex}
  .menu a{padding-block:12px;border-bottom:1px solid var(--line)}
  header.nav .nav-cta{display:none}
}

/* Nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--f-body);font-weight:600;font-size:15px;padding:13px 24px;border-radius:2px;text-decoration:none;border:1px solid var(--ink);cursor:pointer;transition:background .2s,color .2s,border-color .2s;text-align:center}
.btn-dark{background:var(--ink);color:var(--on-ink)}
.btn-dark:hover{background:var(--rose-ink);border-color:var(--rose-ink)}
.btn-line{background:transparent;color:var(--ink)}
.btn-line:hover{background:var(--soft)}
.btn-sm{padding:9px 16px;font-size:14px}
.lien{font-weight:600;text-decoration:none;border-bottom:1.5px solid var(--rose);padding-bottom:1px}
.lien:hover{color:var(--rose-ink)}

/* Khối chung */
section.blk{padding-block:80px}
section.blk + section.blk{border-top:1px solid var(--line)}
section.soft{background:var(--soft)}
section.soft + section.blk,section.blk + section.soft{border-top:0}
.head{display:grid;gap:12px;max-width:46em;margin-bottom:40px}
.head h2{font-size:clamp(28px,3.4vw,44px)}
.head p{color:var(--muted);font-size:17px}
.head-row{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap;margin-bottom:36px}
.head-row .head{margin-bottom:0}
.dong-cuoi{margin-top:32px}

/* Mở đầu trang con */
.page-head{border-bottom:1px solid var(--line)}
.page-head .wrap{padding-block:56px 48px;display:grid;gap:16px}
.page-head h1{font-size:clamp(34px,4.6vw,58px);max-width:18em}
.page-head .lead{font-size:18px;color:var(--muted);max-width:40em}
.crumb{font-size:13px;color:var(--muted)}
.crumb a{text-decoration:none}

/* Hero trang chủ */
.hero{border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;padding-block:48px 0}
.hero-txt{display:grid;gap:22px;padding-bottom:48px;min-width:0}
.hero h1{font-size:clamp(36px,5vw,64px);letter-spacing:-.01em}
.hero h1 em{font-style:italic;color:var(--rose-ink)}
.hero .lead{font-size:18px;color:var(--muted);max-width:34em}
.hang-nut{display:flex;gap:12px;flex-wrap:wrap}
.hero-img{align-self:end;position:relative;min-width:0;margin:0}
.hero-img img{width:100%;aspect-ratio:4/5;max-height:600px;object-fit:cover;object-position:top}
.hero-img figcaption{position:absolute;left:0;bottom:22px;background:var(--bg);padding:11px 15px;font-size:13px;line-height:1.4;border:1px solid var(--line)}
.hero-img figcaption b{display:block;font-family:var(--f-display);font-size:17px;font-weight:600}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr;gap:0;padding-top:32px}.hero-txt{padding-bottom:32px}.hero-img{max-width:420px;justify-self:center}}

/* Dải bằng chứng */
.proof{border-bottom:1px solid var(--line)}
.proof .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.proof div{padding:20px 20px;border-left:1px solid var(--line);display:grid;gap:3px;min-width:0}
.proof div:first-child{border-left:0;padding-left:0}
.proof strong{font-family:var(--f-display);font-size:23px;font-weight:600;line-height:1.2}
.proof span{font-size:13px;color:var(--muted);line-height:1.45}
@media (max-width:860px){.proof .wrap{grid-template-columns:1fr 1fr}.proof div:nth-child(3){border-left:0;padding-left:0}.proof div{border-top:1px solid var(--line)}.proof div:nth-child(-n+2){border-top:0}}

/* Lưới cột */
.cot-2{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.cot-2 > *{min-width:0}
@media (max-width:900px){.cot-2{grid-template-columns:1fr;gap:36px}}

/* Ba trụ */
.tru{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line)}
.tru a{padding:30px 28px;display:grid;gap:10px;align-content:start;border-left:1px solid var(--line);text-decoration:none;min-width:0;transition:background .2s}
.tru a:first-child{border-left:0}
.tru a:hover{background:var(--soft)}
.tru .so{font-family:var(--f-mono);font-size:12px;color:var(--rose-ink)}
.tru h3{font-size:25px}
.tru p{color:var(--muted);font-size:15px}
.tru .di{font-size:14px;font-weight:600;margin-top:6px}
@media (max-width:860px){.tru{grid-template-columns:1fr}.tru a{border-left:0;border-top:1px solid var(--line)}.tru a:first-child{border-top:0}}

/* Thẻ bài viết */
.ds-bai{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.the-bai{display:grid;gap:12px;align-content:start;text-decoration:none;min-width:0;border-top:2px solid var(--ink);padding-top:16px}
.the-bai .nhan{font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:600;color:var(--rose-ink)}
.the-bai h3{font-size:23px;line-height:1.25}
.the-bai:hover h3{color:var(--rose-ink)}
.the-bai p{color:var(--muted);font-size:15px}
.the-bai .meta{font-size:13px;color:var(--muted)}
@media (max-width:900px){.ds-bai{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.ds-bai{grid-template-columns:1fr}}

/* Thẻ video */
.ds-video{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.the-video{position:relative;display:grid;grid-template-rows:1fr auto;aspect-ratio:9/13;text-decoration:none;color:var(--on-ink);background:var(--ink);padding:18px;overflow:hidden;min-width:0;border-radius:2px}
.the-video::before{content:"";position:absolute;inset:0;background:radial-gradient(120% 80% at 100% 0%,color-mix(in srgb,var(--rose) 70%,transparent),transparent 60%);opacity:.9}
.the-video > *{position:relative}
.the-video .chu-de{font-size:11px;letter-spacing:.14em;text-transform:uppercase;font-weight:600;opacity:.85}
.the-video .ten{font-family:var(--f-display);font-size:21px;line-height:1.2;align-self:end}
.the-video .so-xem{display:flex;justify-content:space-between;align-items:center;font-size:13px;margin-top:12px;padding-top:10px;border-top:1px solid color-mix(in srgb,var(--on-ink) 30%,transparent)}
.the-video .so-xem b{font-family:var(--f-mono);font-weight:500}
.the-video .play{width:38px;height:38px;border-radius:50%;border:1px solid color-mix(in srgb,var(--on-ink) 60%,transparent);display:grid;place-items:center}
.the-video .play svg{width:14px;height:14px;margin-left:2px}
.the-video:hover .play{background:var(--on-ink);color:var(--ink)}
@media (max-width:900px){.ds-video{grid-template-columns:repeat(2,1fr)}}
.chu-nho{font-size:13px;color:var(--muted)}

/* Danh sách có vạch */
.vach{list-style:none;padding:0;margin:0;display:grid;border-top:1px solid var(--line)}
.vach li{display:grid;grid-template-columns:150px 1fr;gap:16px;padding-block:13px;border-bottom:1px solid var(--line);font-size:15px}
.vach li > span:first-child{color:var(--muted);font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;font-weight:600;padding-top:2px}
@media (max-width:600px){.vach li{grid-template-columns:1fr;gap:2px}}

/* Trích dẫn */
.trich{font-family:var(--f-display);font-style:italic;font-size:clamp(21px,2.4vw,28px);line-height:1.38;text-wrap:balance;border-left:2px solid var(--rose);padding-left:20px}
.trich small{display:block;margin-top:10px;font-family:var(--f-body);font-style:normal;font-size:13px;color:var(--muted)}

/* Ảnh */
.anh-luoi{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.anh-luoi figure{margin:0;display:grid;gap:8px;min-width:0}
.anh-luoi figure.rong{grid-column:1/-1}
.anh-luoi img{width:100%;aspect-ratio:4/3;object-fit:cover}
.anh-luoi figure.rong img{aspect-ratio:16/11}
.anh-luoi figcaption{font-size:13px;color:var(--muted);line-height:1.45}

/* Mốc thời gian */
.moc{list-style:none;padding:0;margin:0;display:grid;gap:0;border-left:1px solid var(--line)}
.moc li{position:relative;padding:0 0 26px 24px}
.moc li::before{content:"";position:absolute;left:-5px;top:7px;width:9px;height:9px;border-radius:50%;background:var(--rose)}
.moc b{display:block;font-family:var(--f-mono);font-size:13px;font-weight:500;color:var(--rose-ink)}
.moc p{font-size:15px}

/* Thẻ chung */
.the{border:1px solid var(--line);padding:26px;display:grid;gap:10px;align-content:start;min-width:0;background:var(--bg)}
.the h3{font-size:22px}
.the p{color:var(--muted);font-size:15px}
.luoi-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.luoi-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:900px){.luoi-3{grid-template-columns:1fr 1fr}}
@media (max-width:620px){.luoi-3,.luoi-2{grid-template-columns:1fr}}
.trang-thai{display:inline-flex;width:max-content;font-size:12px;font-weight:600;padding:3px 10px;border-radius:20px;border:1px solid var(--line);color:var(--muted)}
.trang-thai.mo{background:var(--ink);color:var(--on-ink);border-color:var(--ink)}

/* Nhãn thành phần (chữ ký riêng) */
.nhan-tp{border:2px solid var(--ink);padding:22px 24px 18px;background:var(--bg);font-size:15px;min-width:0}
.nhan-tp .top{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;border-bottom:8px solid var(--ink);padding-bottom:10px}
.nhan-tp .top h3{font-family:var(--f-body);font-weight:700;font-size:27px;letter-spacing:-.01em;line-height:1.05}
.nhan-tp .top span{font-family:var(--f-mono);font-size:11px;color:var(--muted);text-align:right;line-height:1.4}
.nhan-tp .sub{display:flex;justify-content:space-between;font-size:13px;font-weight:600;border-bottom:3px solid var(--ink);padding-block:8px}
.nhan-tp .dong{display:grid;grid-template-columns:52px 1fr;gap:14px;padding-block:14px;border-bottom:1px solid var(--ink)}
.nhan-tp .dong .b{font-family:var(--f-mono);font-size:13px;font-weight:500}
.nhan-tp .dong h4{margin:0 0 4px;font-size:16px;font-weight:700;line-height:1.35}
.nhan-tp .dong p{color:var(--muted);font-size:14px;line-height:1.55}
.tag{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.tag span{font-family:var(--f-mono);font-size:11px;padding:3px 8px;border:1px solid var(--line);border-radius:20px}
.nhan-tp .foot{font-size:12px;color:var(--muted);padding-top:12px;line-height:1.55}
.nhan-tp .foot b{color:var(--ink)}

/* Bài viết */
.bai > .wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:64px;align-items:start;padding-block:48px 80px}
.bai-than{min-width:0;max-width:720px;font-size:17px;line-height:1.75}
.bai-than > * + *{margin-top:18px}
.bai-than h2{font-size:clamp(25px,2.6vw,32px);margin-top:44px;scroll-margin-top:90px}
.bai-than h3{font-family:var(--f-body);font-size:19px;font-weight:700;margin-top:28px}
.bai-than ul,.bai-than ol{padding-left:22px}
.bai-than li + li{margin-top:6px}
.bai-than strong{font-weight:600}
.bai-than a{color:var(--rose-ink)}
.bang{overflow-x:auto;border:1px solid var(--line)}
.bang table{border-collapse:collapse;width:100%;font-size:15px;min-width:520px}
.bang th,.bang td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.bang th{background:var(--soft);font-size:13px;letter-spacing:.04em}
.bang tr:last-child td{border-bottom:0}
.chip-do{color:var(--rose-ink);font-weight:600}
.chip-xanh{color:var(--ok);font-weight:600}
.tac-gia{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:center;border-block:1px solid var(--line);padding-block:16px;font-size:14px;color:var(--muted)}
.tac-gia img{width:64px;height:64px;border-radius:50%;object-fit:cover;object-position:top}
.tac-gia b{color:var(--ink);font-size:15px}
.nhap-bs{background:var(--cho);color:var(--cho-ink);padding:12px 16px;font-size:14px;border-radius:2px}
.muc-luc{background:var(--soft);padding:18px 22px}
.muc-luc b{font-size:13px;letter-spacing:.1em;text-transform:uppercase}
.muc-luc ol{margin:10px 0 0;padding-left:20px;font-size:15px}
.muc-luc a{color:var(--ink);text-decoration:none}
.muc-luc a:hover{color:var(--rose-ink)}
.hop-luu-y{border-left:2px solid var(--rose);padding:4px 0 4px 18px;font-size:16px}
.nguon{font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:18px}
.nguon ol{padding-left:20px;margin:8px 0 0}
.nguon a{color:var(--muted)}
.ben{position:sticky;top:96px;display:grid;gap:18px}
.ben .the{padding:22px}
.ben .the h3{font-size:20px}
@media (max-width:980px){.bai > .wrap{grid-template-columns:1fr;gap:40px}.ben{position:static}}

/* Hỏi đáp */
.faq{border-top:1px solid var(--ink);max-width:880px}
details{border-bottom:1px solid var(--line)}
summary{list-style:none;cursor:pointer;padding:18px 0;font-size:17px;font-weight:600;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-family:var(--f-display);font-size:26px;line-height:1;color:var(--rose-ink);transition:transform .2s;flex-shrink:0}
details[open] summary::after{transform:rotate(45deg)}
details > p,details > div{padding:0 0 20px;color:var(--muted);max-width:46em}

/* Form */
.form{display:grid;gap:14px;background:var(--bg);color:var(--ink);padding:28px;border:1px solid var(--line);min-width:0}
.form h3{font-family:var(--f-body);font-weight:700;font-size:20px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.row > *{min-width:0}
label{display:grid;gap:6px;font-size:13px;font-weight:600}
input,select,textarea{font:inherit;font-weight:400;font-size:15px;padding:12px 14px;border:1px solid var(--line);border-radius:2px;background:var(--bg);color:var(--ink);width:100%}
textarea{min-height:110px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--ink)}
fieldset{border:0;padding:0;margin:0;display:grid;gap:8px}
legend{font-size:13px;font-weight:600;margin-bottom:8px}
.chon{display:flex;flex-wrap:wrap;gap:8px}
.chon label{display:inline-flex;gap:8px;align-items:center;font-weight:500;font-size:14px;border:1px solid var(--line);padding:9px 14px;border-radius:2px;cursor:pointer}
.chon input{width:auto;margin:0;accent-color:var(--ink)}
.chon label:has(input:checked){border-color:var(--ink);background:var(--soft)}
.form .btn{width:100%}
.ok{font-size:14px;background:var(--soft);padding:12px 14px;border-left:2px solid var(--rose)}
.fine{font-size:12px;color:var(--muted);line-height:1.5}
.goi-y{border:1px solid var(--ink);padding:16px 18px;display:grid;gap:6px;font-size:15px}
.goi-y b{font-family:var(--f-display);font-size:20px;font-weight:600}
@media (max-width:620px){.row{grid-template-columns:1fr}.form{padding:20px}}

/* Dải tối mời hành động */
.toi{background:var(--ink);color:var(--on-ink)}
.toi .wrap{padding-block:72px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.toi h2{font-size:clamp(28px,3.4vw,42px)}
.toi p{opacity:.8;font-size:17px;margin-top:12px}
.toi .btn-dark{background:var(--on-ink);color:var(--ink);border-color:var(--on-ink)}
.toi .btn-dark:hover{background:var(--rose);border-color:var(--rose);color:var(--ink)}
.toi .btn-line{color:var(--on-ink);border-color:color-mix(in srgb,var(--on-ink) 50%,transparent)}
.toi .btn-line:hover{background:color-mix(in srgb,var(--on-ink) 10%,transparent)}
.toi .hang-nut{justify-content:flex-end}
@media (max-width:860px){.toi .wrap{grid-template-columns:1fr}.toi .hang-nut{justify-content:flex-start}}

/* Kênh */
.kenh{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:10px}
.kenh a{display:inline-flex;align-items:center;gap:10px;text-decoration:none;border:1px solid var(--line);padding:9px 14px 9px 10px;border-radius:2px;font-size:14px;background:var(--bg)}
.kenh a:hover{border-color:var(--ink)}
.kenh svg{width:20px;height:20px;flex-shrink:0}
.kenh span{display:grid;line-height:1.25}
.kenh small{color:var(--muted);font-size:12px}

/* Chân trang */
footer{border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
footer .wrap{padding-block:48px 32px;display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:36px}
footer h4{margin:0 0 10px;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink)}
footer ul{list-style:none;padding:0;margin:0;display:grid;gap:7px}
footer a{text-decoration:none}
footer a:hover{color:var(--ink)}
footer .brand .dr{color:var(--ink)}
footer .canh{grid-column:1/-1;border-top:1px solid var(--line);padding-top:20px;font-size:12.5px;line-height:1.6}
footer .canh b{color:var(--ink)}
@media (max-width:760px){footer .wrap{grid-template-columns:1fr 1fr}footer .wrap > div:first-child{grid-column:1/-1}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Ghi chú cho người làm nghề (định vị đào tạo chủ spa) */
.ghi-nghe{border:1px solid var(--ink);padding:18px 20px;display:grid;gap:10px;background:var(--bg)}
.ghi-nghe > b{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--rose-ink)}
.ghi-nghe p{font-size:16px}
/* Học theo vấn đề da (kiểu shop by concern của Dermstore) */
.van-de{display:flex;flex-wrap:wrap;gap:10px}
.van-de a{display:inline-flex;align-items:center;gap:8px;text-decoration:none;border:1px solid var(--line);padding:12px 18px;border-radius:40px;font-size:15px;font-weight:500;background:var(--bg)}
.van-de a:hover,.van-de a[aria-current="true"]{border-color:var(--ink);background:var(--ink);color:var(--on-ink)}
.van-de small{font-family:var(--f-mono);font-size:11px;opacity:.7}
/* Từ điển hoạt chất */
.tu-dien{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.muc-hc{border:1px solid var(--line);padding:22px 24px;display:grid;gap:10px;align-content:start;min-width:0;scroll-margin-top:90px}
.muc-hc h3{font-size:24px}
.muc-hc .nhom{font-family:var(--f-mono);font-size:11px;color:var(--rose-ink);letter-spacing:.06em;text-transform:uppercase}
.muc-hc dl{display:grid;grid-template-columns:110px 1fr;gap:6px 14px;margin:0;font-size:15px}
.muc-hc dt{color:var(--muted);font-size:13px;font-weight:600}
.muc-hc dd{margin:0}
.muc-hc .loi{font-family:var(--f-display);font-style:italic;font-size:17px;border-left:2px solid var(--rose);padding-left:12px}
.az{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:28px}
.az a{font-family:var(--f-mono);font-size:13px;text-decoration:none;border:1px solid var(--line);padding:6px 10px;border-radius:2px}
.az a:hover{border-color:var(--ink)}
@media (max-width:820px){.tu-dien{grid-template-columns:1fr}.muc-hc dl{grid-template-columns:1fr;gap:2px}}
/* Khối sổ tay sắp ra mắt */
.so-tay{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;border:2px solid var(--ink);padding:36px}
.so-tay > *{min-width:0}
.so-tay h2{font-size:clamp(26px,3vw,38px)}
.so-tay p{color:var(--muted);font-size:16px}
.so-tay .form{border:0;padding:0}
@media (max-width:860px){.so-tay{grid-template-columns:1fr;padding:24px}}

.bai-than .ds-video{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
.bai-than .the-video .ten{font-size:19px}
.bai-than .the-video{margin-top:0}
.bai-than a.the-video{color:var(--on-ink);text-decoration:none}

/* ===== Bản 3 (06/11): menu 5 mục ngang, video phát trên trang, thẻ có ảnh, bộ lọc ngang ===== */
header.nav .wrap{flex-wrap:wrap;row-gap:8px}
header.nav .menu{display:flex!important;position:static;flex-direction:row;gap:26px;padding:0;border:0;background:none;margin-left:auto;font-size:15px}
header.nav .menu a{padding-block:4px;border-bottom:1.5px solid transparent}
@media (max-width:760px){
  header.nav .wrap{padding-block:10px 0}
  header.nav .menu{margin-left:0;width:100%;overflow-x:auto;flex-wrap:nowrap;gap:8px;justify-content:space-between;font-size:13px;padding-bottom:6px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
  header.nav .menu::-webkit-scrollbar{display:none}
  header.nav .menu a{border-bottom:2px solid transparent;padding-block:8px;flex-shrink:0;white-space:nowrap}
}
/* Video */
.ds-video{grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}
figure.vd{margin:0;display:grid;gap:10px;align-content:start;min-width:0}
figure.vd video{width:100%;aspect-ratio:9/16;object-fit:cover;background:var(--ink);border-radius:2px;display:block}
figure.vd figcaption{display:grid;gap:2px;font-size:13px;color:var(--muted)}
figure.vd figcaption b{font-family:var(--f-display);font-size:18px;font-weight:600;color:var(--ink);line-height:1.25}
figure.vd figcaption a{color:var(--rose-ink);font-weight:600;text-decoration:none;margin-top:2px}
figure.vd-lon{max-width:340px;margin-inline:auto}
.bai-than figure.vd-lon{margin-block:8px 6px}
.bai-than .ds-video{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
/* Thẻ bài có ảnh */
.the-bai{border-top:0;padding-top:0}
.the-bai img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center 25%;border-radius:2px;margin-bottom:4px;transition:opacity .2s}
.the-bai:hover img{opacity:.88}
.ds-bai{grid-template-columns:repeat(4,1fr)}
@media (max-width:1000px){.ds-bai{grid-template-columns:repeat(3,1fr)}}
@media (max-width:760px){.ds-bai{grid-template-columns:1fr 1fr;gap:18px}.the-bai h3{font-size:19px}.the-bai p{display:none}}
/* Bộ lọc ngang */
.loc{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;margin-bottom:28px;scrollbar-width:none}
.loc::-webkit-scrollbar{display:none}
.loc button,.loc a{flex-shrink:0;font:inherit;font-size:14px;font-weight:500;border:1px solid var(--line);background:var(--bg);color:var(--ink);padding:9px 16px;border-radius:40px;cursor:pointer;text-decoration:none}
.loc button[aria-pressed="true"],.loc a:hover,.loc button:hover{background:var(--ink);color:var(--on-ink);border-color:var(--ink)}
[data-nhom][hidden]{display:none!important}
/* Album ảnh */
.album{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.album figure{margin:0;display:grid;gap:6px;min-width:0}
.album img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:2px}
.album figure.to{grid-column:span 2;grid-row:span 2}
.album figure.to img{aspect-ratio:auto;height:100%;min-height:0}
.album figcaption{font-size:12.5px;color:var(--muted);line-height:1.4}
@media (max-width:860px){.album{grid-template-columns:1fr 1fr}.album figure.to{grid-column:span 2;grid-row:auto}.album figure.to img{aspect-ratio:4/3}}
/* Danh mục khoá */
.ds-khoa{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.khoa{border:1px solid var(--line);padding:22px;display:grid;gap:10px;align-content:start;background:var(--bg);min-width:0}
.khoa .tren{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap}
.khoa .ai-hoc{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--rose-ink);font-weight:600}
.khoa h3{font-size:22px}
.khoa p{color:var(--muted);font-size:15px}
.khoa.mo{border:2px solid var(--ink)}
@media (max-width:900px){.ds-khoa{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.ds-khoa{grid-template-columns:1fr}}
.bao-chi{list-style:none;padding:0;margin:0;display:grid;border-top:1px solid var(--line)}
.bao-chi li{display:grid;grid-template-columns:140px 1fr;gap:14px;padding-block:12px;border-bottom:1px solid var(--line);font-size:15px}
.bao-chi li span{color:var(--muted);font-size:13px}
.bao-chi a{text-decoration:none;font-weight:500}
.bao-chi a:hover{color:var(--rose-ink)}
@media (max-width:600px){.bao-chi li{grid-template-columns:1fr;gap:2px}}

/* ===== Bản 3b (06/11): video là phụ, nhỏ gọn; blog là chính ===== */
.ds-video{grid-template-columns:repeat(auto-fill,170px);gap:18px;justify-content:start}
figure.vd video{aspect-ratio:9/16;max-height:300px}
figure.vd figcaption b{font-size:15px}
figure.vd figcaption{font-size:12px}
/* video trong bài: nằm gọn góc phải, chữ chạy quanh */
.bai-than figure.vd-lon{float:right;width:200px;max-width:45%;margin:4px 0 18px 26px}
.bai-than figure.vd-lon video{max-height:none}
.bai-than h2{clear:none}
.bai-than .nguon,.bai-than .ghi-nghe,.bai-than .bang,.bai-than .faq{clear:both}
.bai-than .ds-video{grid-template-columns:repeat(auto-fill,150px)}
@media (max-width:600px){.bai-than figure.vd-lon{width:150px;margin-left:16px}}
/* thẻ bài: ảnh ngang kiểu blog */
.the-bai img{aspect-ratio:16/10;object-position:50% 28%}
.ds-bai{grid-template-columns:repeat(3,1fr);gap:32px 28px}
@media (max-width:900px){.ds-bai{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.ds-bai{grid-template-columns:1fr}.the-bai p{display:block}}
figure.vd-lon{max-width:240px}
.bai-than figure.vd-lon{max-width:45%}
.the-bai img{height:auto}

/* Bảng trong bài, trên điện thoại: bảng từ 3 cột xếp thành thẻ dọc (main.js gắn lớp .xep + nhãn cột) · 06/11/2026 */
@media (max-width:640px){
  .bai-than .bang.xep{overflow:visible}
  .bai-than .bang.xep table{min-width:0}
  .bai-than .bang.xep thead{display:none}
  .bai-than .bang.xep table,.bai-than .bang.xep tbody,.bai-than .bang.xep tr,.bai-than .bang.xep td{display:block;width:100%}
  .bai-than .bang.xep tr{padding:12px 0;border-bottom:1px solid var(--line)}
  .bai-than .bang.xep tr:last-child{border-bottom:0}
  .bai-than .bang.xep td{border:0;padding:3px 16px}
  .bai-than .bang.xep td:first-child{font-size:16px;padding-bottom:6px}
  .bai-than .bang.xep td:not(:first-child)::before{content:attr(data-nhan);display:block;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-top:4px}
}