/* Bố cục theo mockup CLHH_WEB_DEMO_001: hero ảnh tràn → 5 thẻ → 3 bước → công cụ → kiến thức → dải tối "Cô Long chia sẻ" → "Bắt đầu" → footer.
   Tỷ lệ màu theo mockup 001: kem 65% · xanh trầm 20% · trắng 10% · đồng 5%. Màu là mã khóa tone CLHH, chưa phải token đã duyệt. Font: đề xuất, chưa chốt giấy phép. */
:root{
  color-scheme:light;
  --kem:#F8F5ED; --ngoc:#E4EEE7; --tram:#213631; --dong:#B29160; --trang:#FFFFFF;
  --chu-phu:#4C5E58; --vien:#DED8C8; --dong-dam:#7A5F33; --tren-dong:#1A2B27; --tram-sang:#C9D3CE;
  --moc:#4F7A4A; --hoa:#B4533C; --tho:#A9823F; --kim:#7C8480; --thuy:#2E4A5C;
  --f-tieude:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --f-noidung:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(env(safe-area-inset-top,0px) + 70px)}
body{background:var(--kem);color:var(--tram);font-family:var(--f-noidung);font-size:16.5px;line-height:1.7}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--tram)}
.in{max-width:1160px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
h1,h2,h3{font-family:var(--f-tieude);font-weight:700;line-height:1.12;text-wrap:balance;margin:0;color:var(--tram)}
h1{font-size:clamp(2.5rem,6vw,4.4rem);font-weight:600}
h2{font-size:clamp(1.9rem,4vw,2.7rem);font-weight:600}
h3{font-size:1.4rem}
p{margin:0}
a{color:inherit}
.nhan{font-size:.76rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--dong-dam)}
.doc{max-width:66ch}
.mo{font-size:1.1rem;color:var(--chu-phu)}
.stack{display:grid;gap:14px}
.giua{text-align:center;justify-items:center}

/* Tiêu đề giữa có hai vạch đồng như mockup */
.tieude-giua{display:grid;justify-items:center;gap:10px;text-align:center;margin-bottom:36px}
.tieude-giua h2{display:flex;align-items:center;gap:18px}
.tieude-giua h2::before,.tieude-giua h2::after{content:"";width:48px;height:1px;background:var(--dong);flex:none}
@media (max-width:520px){.tieude-giua h2::before,.tieude-giua h2::after{width:20px}}
.tieude-giua .mo{max-width:60ch}

/* Dải trạng thái nội bộ */
.trangthai{background:var(--tram);color:var(--kem);font-size:.8rem}
.trangthai .in{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;justify-content:space-between;padding-block:7px}
.trangthai .nut-nho{font:inherit;font-size:.78rem;background:transparent;color:var(--kem);border:1px solid rgba(248,245,237,.5);border-radius:4px;padding:3px 10px;cursor:pointer;text-decoration:none}
.trangthai .nut-nho[aria-pressed="true"]{background:var(--dong);border-color:var(--dong);color:var(--tren-dong)}
.trangthai .nhom{display:flex;gap:8px;flex-wrap:wrap}

/* Header */
header.site{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(248,245,237,.97);border-bottom:1px solid var(--vien)}
header.site .in{display:flex;align-items:center;gap:20px;min-height:62px}
.thuonghieu{font-family:var(--f-tieude);font-weight:600;font-size:1.25rem;letter-spacing:.06em;white-space:nowrap;text-decoration:none}
nav.neo{flex:1;min-width:0;overflow-x:auto;scrollbar-width:none}
nav.neo::-webkit-scrollbar{display:none}
nav.neo ul{display:flex;gap:2px;list-style:none;margin:0;padding:0;justify-content:flex-end;align-items:center}
nav.neo a{display:block;padding:8px 11px;font-size:.88rem;text-decoration:none;white-space:nowrap;border-radius:4px;color:var(--chu-phu)}
nav.neo a:hover,nav.neo a.on{color:var(--tram);background:var(--ngoc)}
nav.neo a.cta{background:var(--dong);color:var(--tren-dong);font-weight:600;border-radius:999px;padding:8px 16px;margin-left:6px}
@media (max-width:760px){header.site .in{flex-wrap:wrap;gap:0;padding-block:6px}.thuonghieu{width:100%}nav.neo ul{justify-content:flex-start}}

/* Nút */
.nut{display:inline-flex;align-items:center;gap:10px;padding:12px 24px;border-radius:999px;font-weight:600;font-size:.95rem;text-decoration:none;border:1px solid transparent;transition:background .15s}
.nut.dong{background:var(--dong);color:var(--tren-dong)}
.nut.dong:hover{background:#C2A273}
.nut.vien{border-color:var(--tram);color:var(--tram);background:transparent}
.nut.vien:hover{background:var(--ngoc)}
.nut .mui{font-size:1.1em;line-height:1}
.nut:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--dong);outline-offset:2px}

/* Hero ảnh tràn */
.hero{position:relative;overflow:hidden;background:var(--kem)}
.hero img.nen{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:72% 50%}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(248,245,237,.96) 0%,rgba(248,245,237,.88) 34%,rgba(248,245,237,.15) 62%,rgba(248,245,237,0) 100%)}
.hero .in{position:relative;z-index:1;padding-block:88px 96px}
.hero .khoi{max-width:520px;display:grid;gap:18px}
.hero .ghi-anh{position:absolute;right:max(16px,env(safe-area-inset-right,0px));bottom:12px;z-index:1;font-size:.7rem;background:rgba(33,54,49,.78);color:var(--kem);padding:3px 8px;border-radius:3px}
.hang-nut{display:flex;flex-wrap:wrap;gap:12px}
@media (max-width:760px){
  .hero img.nen{position:relative;height:auto;aspect-ratio:4/3;object-position:78% 50%}
  .hero::after{display:none}
  .hero .in{padding-block:24px 40px}
  .hero .ghi-anh{top:12px;bottom:auto}
}

/* Ảnh có nhãn */
.anh{position:relative;border-radius:6px;overflow:hidden;background:var(--ngoc);margin:0}
.anh img{display:block;width:100%;height:auto;aspect-ratio:1672/941;object-fit:cover}
.anh figcaption{position:absolute;left:10px;bottom:10px;font-size:.7rem;background:rgba(33,54,49,.78);color:var(--kem);padding:3px 8px;border-radius:3px}

section{padding-block:76px}
@media (max-width:640px){section{padding-block:54px}}
.nen-trang{background:var(--trang)}
.nen-ngoc{background:var(--ngoc)}
.nen-tram{background:var(--tram);color:var(--kem)}
.nen-tram h2,.nen-tram h3{color:var(--kem)}
.nen-tram .nhan{color:var(--dong)}
.nen-tram .mo{color:var(--tram-sang)}
.hai{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:44px;align-items:center}
.hai.nguoc>figure{order:2}
@media (max-width:860px){.hai{grid-template-columns:1fr;gap:24px}.hai.nguoc>figure{order:0}}

/* Năm thẻ hành */
.the5{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px}
@media (max-width:860px){.the5{gap:8px}.the-h{padding-bottom:10px;gap:6px}.the-h .o-mau{aspect-ratio:1/1}.the-h .o-mau span{font-size:1.45rem}.the-h b{font-size:1.15rem}.the-h small{display:none}}
.the-h{appearance:none;font:inherit;color:inherit;text-align:center;background:var(--trang);border:1px solid var(--vien);border-radius:6px;padding:0 0 16px;cursor:pointer;display:grid;gap:10px;overflow:hidden;transition:transform .15s,box-shadow .15s}
.the-h:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(33,54,49,.08)}
.the-h[aria-pressed="true"]{border-color:var(--tram);box-shadow:0 0 0 1px var(--tram)}
.the-h .o-mau{aspect-ratio:4/3;display:grid;place-items:center;background:var(--c);color:#fff}
.the-h .o-mau span{font-family:"Noto Serif SC","Songti SC",serif;font-size:3.2rem;line-height:1;opacity:.95}
.the-h b{font-family:var(--f-tieude);font-size:1.45rem;font-weight:600;line-height:1}
.the-h b::after{content:"";display:block;width:28px;height:1px;background:var(--dong);margin:8px auto 0}
.the-h small{font-size:.82rem;color:var(--chu-phu);padding-inline:10px}
.chi-tiet{margin-top:28px;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:36px;align-items:center;background:var(--trang);border:1px solid var(--vien);border-radius:8px;padding:28px}
@media (max-width:860px){.chi-tiet{grid-template-columns:1fr;padding:20px}}
.chi-tiet svg{width:100%;max-width:400px;height:auto;display:block;margin:0 auto}
.node{cursor:pointer}
.node:focus{outline:none}
.node:focus-visible .vien-node,.node.on .vien-node{stroke:var(--tram);stroke-width:3}
.chuthich{display:flex;gap:18px;flex-wrap:wrap;font-size:.85rem;color:var(--chu-phu);justify-content:center;margin-top:8px}
.chuthich span{display:inline-flex;gap:8px;align-items:center}
.ten-hanh{font-family:var(--f-tieude);font-size:2.6rem;font-weight:600;line-height:1}
dl.kv{display:grid;grid-template-columns:auto 1fr;gap:6px 18px;margin:0;font-size:.95rem}
dl.kv dt{color:var(--chu-phu)}
dl.kv dd{margin:0}
.cham{display:inline-flex;align-items:center;gap:7px;font-weight:600}
.cham::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--c,var(--tram));flex:none}
.de-hieu{background:var(--ngoc);border-radius:6px;padding:12px 14px;font-size:.95rem}
.de-hieu b{color:var(--dong-dam);font-weight:600}
.ghi-y{font-size:.86rem;color:var(--chu-phu)}

/* Hiểu sai */
.hieusai{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
@media (max-width:860px){.hieusai{grid-template-columns:1fr}}
.hs{background:var(--kem);border-radius:6px;padding:22px;display:grid;gap:10px;align-content:start}
.hs .sai{font-size:.92rem;color:var(--hoa);font-weight:600}
.hs .sai::before{content:"Hay nghe: ";color:var(--chu-phu);font-weight:500}
.hs .dung{font-weight:600}
.hs .dung::before{content:"Coi kỹ thì: ";color:var(--moc);font-weight:600}
.hs p.ghi{font-size:.93rem;color:var(--chu-phu)}

/* Ba bước */
.ba-buoc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;position:relative;max-width:900px;margin:0 auto}
.ba-buoc::before{content:"";position:absolute;top:30px;left:16.6%;right:16.6%;border-top:1px dashed var(--dong)}
.buoc-o{display:grid;justify-items:center;gap:10px;text-align:center;padding-inline:12px;position:relative}
.buoc-o .so{width:60px;height:60px;border-radius:50%;border:1px solid var(--dong);background:var(--trang);display:grid;place-items:center;font-family:var(--f-tieude);font-size:1.5rem;font-weight:600;color:var(--dong-dam)}
.buoc-o b{font-weight:600}
.buoc-o p{font-size:.92rem;color:var(--chu-phu)}
@media (max-width:640px){.ba-buoc{grid-template-columns:1fr;gap:22px}.ba-buoc::before{display:none}}

/* Công cụ */
.cong-cu-khung{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:28px;align-items:start}
@media (max-width:960px){.cong-cu-khung{grid-template-columns:1fr}}
.cong-cu{background:var(--trang);border:1px solid var(--vien);border-radius:8px;padding:26px;display:grid;gap:20px}
.hang{display:flex;flex-wrap:wrap;gap:14px;align-items:end}
.truong{display:grid;gap:5px}
.truong label{font-size:.85rem;color:var(--chu-phu)}
input[type=number],select{font:inherit;font-size:1.05rem;padding:10px 12px;border:1px solid #B9B29D;border-radius:4px;background:var(--trang);color:var(--tram);width:150px}
.chon{display:flex;gap:9px;align-items:center;font-size:.92rem;cursor:pointer}
.chon input{width:18px;height:18px;accent-color:var(--tram)}
.ket-qua{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
@media (max-width:760px){.ket-qua{grid-template-columns:repeat(2,minmax(0,1fr))}}
.o-kq{background:var(--kem);border-radius:6px;padding:12px 14px;display:grid;gap:3px;align-content:start}
.o-kq .l{font-size:.78rem;color:var(--chu-phu)}
.o-kq .v{font-family:var(--f-tieude);font-size:1.6rem;font-weight:600;line-height:1.1}
.o-kq .s{font-size:.86rem}
.loi-khuyen{border:1px solid var(--dong);border-radius:8px;padding:20px 22px;display:grid;gap:12px;background:#FDFBF6}
.loi-khuyen .dau-lk{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;align-items:baseline}
.loi-khuyen h3{font-size:1.35rem}
.loi-khuyen ol{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.loi-khuyen li{display:grid;grid-template-columns:110px 1fr;gap:12px}
.loi-khuyen li span{font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--dong-dam);padding-top:3px}
@media (max-width:520px){.loi-khuyen li{grid-template-columns:1fr;gap:2px}}
.gioi-han{font-size:.86rem;color:var(--chu-phu);border-top:1px solid var(--vien);padding-top:10px}
details.buoc{font-size:.92rem;color:var(--chu-phu)}
details.buoc summary{cursor:pointer;color:var(--tram);font-weight:600}
details.buoc ol{margin:10px 0 0;padding-left:1.3em;display:grid;gap:4px;font-variant-numeric:tabular-nums}
.loi{color:var(--hoa);font-weight:600}
.ben{display:grid;gap:14px}
.ben .o{background:var(--trang);border:1px solid var(--vien);border-radius:8px;padding:20px;display:grid;gap:10px}

/* Bảng */
.bang{overflow-x:auto;border:1px solid var(--vien);border-radius:6px;background:var(--trang)}
table{border-collapse:collapse;width:100%;font-size:.93rem}
th,td{padding:10px 14px;border-bottom:1px solid var(--vien);text-align:left;vertical-align:top}
thead th{font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--chu-phu);font-weight:600;background:var(--kem)}
tbody tr:last-child td,tbody tr:last-child th{border-bottom:0}
tbody th{font-weight:600}
td.so{font-variant-numeric:tabular-nums;color:var(--chu-phu)}
.min640{min-width:640px}.min520{min-width:520px}

.chuky{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px}
@media (max-width:860px){.chuky{grid-template-columns:1fr}}
.chuoi{font-weight:600;line-height:1.9}
.mo-rong{margin-top:40px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
@media (max-width:760px){.mo-rong{grid-template-columns:1fr}}
.mo-rong .o{border-left:3px solid var(--dong);padding:4px 0 4px 18px;display:grid;gap:6px}
.the-nhan{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;background:var(--ngoc);color:var(--tram);padding:2px 8px;border-radius:3px;justify-self:start}

/* Cô Long chia sẻ */
.chiase{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
@media (max-width:860px){.chiase{grid-template-columns:1fr}}
.the-cs{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);border:1px solid rgba(178,145,96,.45);border-radius:6px;overflow:hidden;text-decoration:none;color:var(--kem);transition:border-color .15s}
.the-cs:hover{border-color:var(--dong)}
.the-cs img{width:100%;height:100%;min-height:200px;object-fit:cover;display:block}
.the-cs .chu{padding:22px;display:grid;gap:10px;align-content:center}
.the-cs h3{font-size:1.45rem}
.the-cs p{font-size:.93rem;color:var(--tram-sang)}
.the-cs .mui{color:var(--dong);font-size:1.3rem}
@media (max-width:520px){.the-cs{grid-template-columns:1fr}.the-cs img{aspect-ratio:16/9;min-height:0}}
.nguon-cs{margin-top:18px;font-size:.84rem;color:var(--tram-sang);text-align:center}

/* Ranh giới + quy trình */
.ranh{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:16px}
.ranh .o{background:var(--trang);border:1px solid var(--vien);border-radius:6px;padding:20px;display:grid;gap:8px;align-content:start}
.ranh .o h3{font-size:1.2rem}
ol.quy{list-style:none;margin:0;padding:0;display:grid;counter-reset:b}
ol.quy li{counter-increment:b;display:grid;grid-template-columns:52px 1fr;gap:16px;padding:16px 0;border-top:1px solid var(--vien)}
ol.quy li::before{content:counter(b,decimal-leading-zero);font-family:var(--f-tieude);font-size:1.8rem;font-weight:600;color:var(--dong-dam);line-height:1}
.checklist{display:grid;gap:8px;list-style:none;padding:0;margin:0}
.checklist li{display:flex;gap:10px;align-items:flex-start}
.checklist li::before{content:"";flex:none;width:16px;height:16px;margin-top:5px;border:1.5px solid var(--dong);border-radius:3px}

/* Bắt đầu */
.bat-dau{position:relative;overflow:hidden;background:#EFE7D6}
.bat-dau .in{display:grid;justify-items:center;text-align:center;gap:16px;padding-block:64px}
.bat-dau h2::after{content:"";display:block;width:48px;height:1px;background:var(--dong);margin:14px auto 0}

footer{background:var(--tram);color:var(--tram-sang);font-size:.88rem;padding-block:48px 56px}
footer .in{display:grid;gap:22px}
footer h3{color:var(--kem);font-size:1.25rem}
footer ul{margin:0;padding-left:1.1em;display:grid;gap:4px}
footer .chuan{border-top:1px solid rgba(248,245,237,.2);padding-top:18px;color:#DCE3DF}

/* Ghi chú thiết kế nội bộ */
.gc{display:none;font-size:.78rem;line-height:1.5;background:#FFF6DF;color:#5A4511;border:1px dashed var(--dong);border-radius:4px;padding:8px 10px;margin-bottom:18px;text-align:left}
.gc b{font-weight:600}
body.xem-gc .gc{display:block}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* ===== Bổ sung cho bộ trang CLHH (trang chủ + 5 môn + cách đọc hồ sơ) ===== */
.hero-chu{background:linear-gradient(180deg,var(--kem) 0%,#EFE7D6 100%);border-bottom:1px solid var(--vien)}
.hero-chu .in{padding-block:72px 64px;display:grid;gap:18px;max-width:1160px}
.hero-chu .khoi{max-width:640px;display:grid;gap:18px}
.hero-chu .dau-mon{font-family:"Noto Serif SC","Songti SC",serif;font-size:2.4rem;color:var(--dong);line-height:1}
@media (max-width:640px){.hero-chu .in{padding-block:44px 40px}}
.mon5{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,210px),1fr));gap:16px}
.the-mon{display:grid;gap:10px;align-content:start;background:var(--trang);border:1px solid var(--vien);border-radius:8px;padding:22px;text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s}
.the-mon:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(33,54,49,.08)}
.the-mon h3{font-size:1.5rem}
.the-mon h3::after{content:"";display:block;width:28px;height:1px;background:var(--dong);margin-top:10px}
.the-mon p{font-size:.92rem;color:var(--chu-phu)}
.the-mon .can{font-size:.82rem}
.the-mon .can b{color:var(--tram);font-weight:600}
.the-mon .mui{color:var(--dong-dam);font-weight:600;font-size:.9rem}
.tag{display:inline-block;font-size:.7rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;padding:2px 8px;border-radius:3px;justify-self:start}
.tag.co{background:var(--ngoc);color:var(--tram)}
.tag.chua{background:#F3E9D6;color:var(--dong-dam)}
.ba-giu{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
@media (max-width:860px){.ba-giu{grid-template-columns:1fr}}
.ba-giu .o{border-top:2px solid var(--dong);padding-top:14px;display:grid;gap:8px}
.chon-o{display:flex;flex-wrap:wrap;gap:8px}
.chon-o button{font:inherit;font-size:.88rem;padding:7px 14px;border:1px solid var(--vien);background:var(--trang);color:var(--tram);border-radius:999px;cursor:pointer}
.chon-o button[aria-pressed="true"]{background:var(--tram);color:var(--kem);border-color:var(--tram)}
.o-chitiet{background:var(--trang);border:1px solid var(--vien);border-radius:8px;padding:24px;display:grid;gap:12px;margin-top:16px}
.o-chitiet h3{font-size:1.7rem}
.ba-cot{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
@media (max-width:760px){.ba-cot{grid-template-columns:1fr}}
.ba-cot .o{background:var(--kem);border-radius:6px;padding:14px;display:grid;gap:6px;align-content:start}
.ba-cot .o b{font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--dong-dam)}
input[type=text],input[type=date]{font:inherit;font-size:1.05rem;padding:10px 12px;border:1px solid #B9B29D;border-radius:4px;background:var(--trang);color:var(--tram);width:min(100%,320px)}
input.hep{width:110px}
.ket-qua.ba{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:760px){.ket-qua.ba{grid-template-columns:repeat(2,minmax(0,1fr))}}
.canh-bao{background:#FBEFE9;border-left:3px solid var(--hoa);padding:10px 14px;border-radius:4px;font-size:.92rem}
.khung-hs{display:grid;gap:0;border:1px solid var(--vien);border-radius:8px;overflow:hidden;background:var(--trang)}
.khung-hs .k{display:grid;grid-template-columns:240px 1fr;gap:18px;padding:18px 22px;border-top:1px solid var(--vien)}
.khung-hs .k:first-child{border-top:0}
.khung-hs .k b{font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--dong-dam)}
@media (max-width:640px){.khung-hs .k{grid-template-columns:1fr;gap:4px}}
.nam-buoc{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;counter-reset:n}
@media (max-width:860px){.nam-buoc{grid-template-columns:1fr}}
.nam-buoc .o{counter-increment:n;background:var(--trang);border:1px solid var(--vien);border-radius:6px;padding:16px;display:grid;gap:6px;align-content:start}
.nam-buoc .o::before{content:counter(n);font-family:var(--f-tieude);font-size:1.6rem;font-weight:600;color:var(--dong-dam);line-height:1}
.dong-thoi{list-style:none;margin:0;padding:0;display:grid;gap:0}
.dong-thoi li{display:grid;grid-template-columns:200px 1fr;gap:18px;padding:14px 0;border-top:1px solid var(--vien)}
.dong-thoi li b{font-family:var(--f-tieude);font-size:1.2rem;font-weight:600}
@media (max-width:640px){.dong-thoi li{grid-template-columns:1fr;gap:2px}}
.chu-mo{font-size:.86rem;color:var(--chu-phu)}
/* Sửa: trên điện thoại menu phải xuống dòng riêng, không bị ép rộng 0 */
@media (max-width:760px){nav.neo{flex:1 1 100%}}

/* ===== V3 (21/10): ảnh theo tài liệu màu–chữ–bố cục CLHH + danh mục tài nguyên ===== */
/* Đầu trang môn: chữ cạnh ảnh (danh mục: "Đặt chữ cạnh ảnh"); mobile ảnh trên, chữ dưới */
.hero-chu.co-anh .in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:44px;align-items:center}
.hero-chu.co-anh .gc{grid-column:1/-1}
@media (max-width:860px){.hero-chu.co-anh .in{grid-template-columns:1fr;gap:22px;padding-block:24px 40px}.hero-chu.co-anh figure{order:-1}}
/* Thẻ môn: ảnh dọc 4:5 (005–009), chữ ngoài ảnh */
.the-mon{padding:0;overflow:hidden}
.the-mon img{display:block;width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;transition:transform .25s ease-out}
.the-mon:hover img{transform:scale(1.03)}
.the-mon .chu{padding:18px 20px 22px;display:grid;gap:10px;align-content:start}
.the-mon .anh-the{overflow:hidden;position:relative}
.the-mon .anh-the span{position:absolute;left:8px;bottom:8px;font-size:.66rem;background:rgba(33,54,49,.78);color:var(--kem);padding:2px 7px;border-radius:3px}
@media (max-width:640px){.mon5{grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:78%;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:10px}.the-mon{scroll-snap-align:start}}
.goi-y-vuot{display:none;font-size:.82rem;color:var(--chu-phu);margin-top:8px}
@media (max-width:640px){.goi-y-vuot{display:block}}
/* Dải CTA: nền 026 xanh trầm, chữ sáng (tài liệu màu–chữ: "Dải CTA") */
.bat-dau.nen-anh{background:#213631 url(img/clhh-026.webp) center/cover no-repeat;color:var(--kem)}
.bat-dau.nen-anh h2{color:var(--kem)}
.bat-dau.nen-anh .mo{color:#DCE3DF}
.bat-dau.nen-anh .nut.vien{border-color:var(--kem);color:var(--kem)}
.bat-dau.nen-anh .nut.vien:hover{background:rgba(248,245,237,.12)}
.bat-dau.nen-anh .in{background:rgba(33,54,49,.55);border-radius:8px;margin-block:40px;padding-inline:24px}
.hai-anh{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;align-items:center;margin-bottom:28px}
@media (max-width:860px){.hai-anh{grid-template-columns:1fr;gap:18px}}
@media (prefers-reduced-motion:reduce){.the-mon img{transition:none}.the-mon:hover img{transform:none}}
/* Ô nhập luôn có viền focus rõ (kể cả ô ngày có phần con bên trong) */
input:focus,select:focus{outline:2px solid var(--dong);outline-offset:2px}
input[type=date]:focus-within{outline:2px solid var(--dong);outline-offset:2px}
nav.neo ul{padding:5px 3px}
nav.neo ul{justify-content:safe flex-end}

/* ===== V4 (22/10): chữ nằm trên ảnh đầu trang + màu riêng từng môn ===== */
.hero{position:relative;overflow:hidden;background:var(--tram);min-height:min(80vh,660px);display:flex;align-items:center}
.hero img.nen{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:var(--pos,60% 50%)}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(var(--tram-rgb),.94) 0%,rgba(var(--tram-rgb),.9) 38%,rgba(var(--tram-rgb),.62) 58%,rgba(var(--tram-rgb),.18) 82%,rgba(var(--tram-rgb),.05) 100%)}
.hero .in{position:relative;z-index:1;width:100%;padding-block:96px}
.hero .khoi{max-width:540px;display:grid;gap:18px}
.hero h1{color:#FFFFFF}
.hero .nhan{color:rgba(255,255,255,.9)}
.hero .mo{color:rgba(255,255,255,.93)}
.hero .dau-mon{color:var(--dong-trang-tri,var(--dong))}
.hero .nut.vien{border-color:rgba(255,255,255,.9);color:#FFFFFF}
.hero .nut.vien:hover{background:rgba(255,255,255,.12)}
.hero .ghi-anh{position:absolute;right:max(16px,env(safe-area-inset-right,0px));top:12px;bottom:auto;z-index:2;font-size:.7rem;background:rgba(0,0,0,.5);color:#FFFFFF;padding:3px 8px;border-radius:3px}
/* Máy tính bảng và điện thoại: ảnh phía trên, chữ ở nửa dưới trên lớp phủ đậm */
@media (max-width:1024px){
  .hero{min-height:640px;align-items:flex-end}
  .hero img.nen{position:absolute;height:100%;aspect-ratio:auto}
  .hero::after{display:block;background:linear-gradient(0deg,rgba(var(--tram-rgb),.96) 0%,rgba(var(--tram-rgb),.92) 52%,rgba(var(--tram-rgb),.5) 74%,rgba(var(--tram-rgb),.08) 100%)}
  .hero .in{padding-block:150px 40px}
  .hero .khoi{max-width:620px}
}
/* bỏ màu cứng để theo màu từng môn */
.loi-khuyen{background:var(--trang)}
.bat-dau{background:var(--ngoc)}
.the-mon,.cong-cu,.o-chitiet,.ranh .o,.ben .o{background:var(--trang)}
header.site{background:color-mix(in srgb,var(--kem) 96%,transparent)}
footer .chuan{color:var(--tram-sang)}
@media (max-width:760px){
  .hero{min-height:700px}
  .hero::after{background:linear-gradient(0deg,rgba(var(--tram-rgb),.96) 0%,rgba(var(--tram-rgb),.93) 66%,rgba(var(--tram-rgb),.55) 82%,rgba(var(--tram-rgb),.08) 100%)}
}

/* ===== V5 (22/10): ảnh bìa để nguyên — không phủ màu, không làm mờ; chữ nằm trong khung nền đặc ===== */
.hero::after{display:none!important}
.hero{min-height:min(84vh,700px);align-items:center}
.hero .in{padding-block:80px}
.hero .khoi{background:rgba(var(--tram-rgb),.94);border-radius:14px;padding:34px 34px 30px;max-width:540px;box-shadow:0 14px 40px rgba(0,0,0,.25)}
@media (max-width:1024px) and (min-width:761px){
  .hero{min-height:620px;align-items:flex-end}
  .hero::after{display:none!important}
  .hero .in{padding-block:200px 40px}
}
/* Điện thoại: ảnh nguyên vẹn ở trên, khung chữ nằm ngay dưới (không đè lên ảnh) */
@media (max-width:760px){
  .hero{display:block;min-height:0;background:var(--tram)}
  .hero img.nen{position:relative;inset:auto;display:block;width:100%;height:auto;aspect-ratio:1672/941;object-fit:cover}
  .hero .in{padding:0}
  .hero .khoi{border-radius:0;box-shadow:none;max-width:none;padding:26px 18px 30px;background:var(--tram)}
}
/* Ảnh nền cho từng khối: ảnh để nguyên, nội dung đặt trong khung nền đặc */
section.co-nen{position:relative;background:var(--tram) var(--nen) center/cover no-repeat;padding-block:96px}
section.co-nen>.in{background:var(--kem);border-radius:14px;padding:46px 40px;box-shadow:0 14px 40px rgba(0,0,0,.2)}
section.co-nen.nen-trang>.in{background:var(--trang)}
section.co-nen.nen-ngoc>.in{background:var(--ngoc)}
section.co-nen.nen-tram>.in{background:var(--tram)}
@media (min-width:1200px){section.co-nen>.in{max-width:1120px}}
@media (max-width:760px){
  section.co-nen{padding-block:56px}
  section.co-nen>.in{margin-inline:12px;padding:28px 16px;border-radius:12px}
}
.hai-anh:not(:has(figure)){display:block}
.bat-dau.nen-anh{background:var(--tram) var(--nen,url(img/clhh-026.webp)) center/cover no-repeat}
.bat-dau.nen-anh .in{background:var(--tram);opacity:1}
/* V6: công cụ lập trụ */
[hidden]{display:none!important}
input[type=time]{font:inherit;font-size:1.05rem;padding:10px 12px;border:1px solid #B9B29D;border-radius:4px;background:var(--trang);color:var(--tram);width:140px}
#bt-thang,#bt-tyqu{width:auto;min-width:230px;max-width:100%}

/* ===== V7 (22/10): trang cho khách — kết quả nổi bật, điểm riêng, biểu đồ ===== */
.kq-chinh{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:center;background:var(--tram);color:#FFFFFF;border-radius:14px;padding:26px 28px}
.kq-chinh .so-lon{font-family:var(--f-tieude);font-size:clamp(4rem,10vw,6.5rem);font-weight:700;line-height:.9;color:var(--dong-trang-tri,var(--dong))}
.kq-chinh .ten{font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.8)}
.kq-chinh .khoa{font-family:var(--f-tieude);font-size:clamp(1.6rem,3.4vw,2.2rem);font-weight:600;line-height:1.15;color:#FFFFFF}
.kq-chinh .dien{color:rgba(255,255,255,.9);margin-top:6px}
@media (max-width:520px){.kq-chinh{grid-template-columns:1fr;gap:8px;padding:22px}}
.o-kq .v{color:var(--tram)}
.o-kq .khoa-nho{display:block;font-weight:600;color:var(--dong-dam);font-size:.88rem}
.o-kq.master{background:var(--tram);color:#FFFFFF}.o-kq.master .l,.o-kq.master .s{color:rgba(255,255,255,.85)}.o-kq.master .v{color:var(--dong-trang-tri,var(--dong))}.o-kq.master .khoa-nho{color:#FFFFFF}
.diem-rieng{border:2px solid var(--dong);border-radius:14px;padding:20px 22px;background:linear-gradient(135deg,var(--trang),var(--ngoc))}
.nhan-dr{font-family:var(--f-tieude);font-size:1.45rem;font-weight:700;color:var(--tram);margin-bottom:12px}
.dr-luoi{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr));gap:12px}
.dr-o{background:var(--trang);border-radius:10px;padding:14px 16px;display:grid;gap:4px;border-left:4px solid var(--dong)}
.dr-so{font-family:var(--f-tieude);font-size:2.1rem;font-weight:700;line-height:1;color:var(--dong-dam)}
.dr-chu{font-size:.92rem;color:var(--tram)}
.dr-chu b{color:var(--dong-dam)}
.dr-nguon{font-size:.78rem;color:var(--chu-phu);margin-top:10px}
.bieu-do{margin:0;background:var(--trang);border:1px solid var(--vien);border-radius:12px;padding:18px 20px}
.bieu-do figcaption{font-weight:600;color:var(--tram);margin-bottom:12px}
.bd-dong-wrap{display:grid;gap:6px}
.bd-dong{display:grid;grid-template-columns:110px 1fr 110px;gap:10px;align-items:center;font-size:.86rem;border-radius:6px;padding:2px 4px}
.bd-dong:hover{background:var(--ngoc)}
.bd-nhan{color:var(--chu-phu);text-align:right}
.bd-ray{height:16px;display:flex;align-items:center}
.bd-cot{display:block;height:14px;background:color-mix(in srgb,var(--tram) 22%,transparent);border-radius:0 4px 4px 0}
.bd-so{color:var(--chu-phu);font-variant-numeric:tabular-nums}
.bd-dong.chon .bd-cot{background:var(--dong-dam);height:18px}
.bd-dong.chon .bd-nhan,.bd-dong.chon .bd-so{color:var(--tram);font-weight:700}
@media (max-width:520px){.bd-dong{grid-template-columns:72px 1fr 92px;gap:6px;font-size:.8rem}}
.bd-bang{margin-top:10px;font-size:.84rem}.bd-bang summary{cursor:pointer;color:var(--chu-phu)}
.kq-xep{display:grid;gap:16px}
mark.nb{background:color-mix(in srgb,var(--dong) 28%,transparent);color:inherit;padding:0 3px;border-radius:3px}
.loi-khuyen{border-width:2px}
.loi-khuyen li:first-child p{font-weight:600;color:var(--tram)}

/* ===== V8 (22/10): khối Kết nối ở chân trang ===== */
.ket-noi{display:grid;gap:16px;padding-bottom:28px;border-bottom:1px solid rgba(255,255,255,.18);scroll-margin-top:90px}
.ket-noi h3{font-size:1.7rem;color:#FFFFFF}
.kn-luoi{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
@media (max-width:960px){.kn-luoi{grid-template-columns:1fr}}
.kn-o{background:var(--trang);color:var(--tram);border-radius:14px;padding:16px;display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center}
.kn-o img{width:120px;height:auto;border-radius:10px;display:block}
.kn-o b{display:block;font-size:1.05rem;color:var(--tram);margin-bottom:4px}
.kn-o p{font-size:.88rem;color:var(--chu-phu);margin-bottom:10px}
.kn-o .nut{padding:9px 18px;font-size:.9rem}
.kn-dt{grid-template-columns:1fr;text-align:left}
.so-dt{display:block;font-family:var(--f-tieude);font-size:2.3rem;font-weight:700;color:var(--dong-dam);text-decoration:none;margin:4px 0 12px;font-variant-numeric:tabular-nums}
@media (max-width:420px){.kn-o{grid-template-columns:96px 1fr}.kn-o img{width:96px}}
.kn-o.kn-dt{grid-template-columns:1fr!important}
.so-dt{font-family:var(--f-noidung);font-size:2rem;font-weight:600;white-space:nowrap;letter-spacing:.02em}
@media (min-width:961px){.kn-o{grid-template-columns:140px 1fr}.kn-o img{width:140px}}


/* ===== V9 (23/10): mobile-first — quy ước tính, khung dừng, bối cảnh, chọn môn, giới thiệu ===== */
.can-nhap{font-size:.92rem;color:var(--chu-phu);margin:0 0 12px;line-height:1.55}
.can-nhap span{font-weight:700;color:var(--tram)}
.quy-uoc{margin:14px 0 4px;border:1px solid color-mix(in srgb,var(--dong) 45%,transparent);border-radius:12px;background:var(--trang)}
.quy-uoc>summary,.boi-canh>summary,details.buoc>summary{min-height:44px;display:flex;align-items:center;cursor:pointer;font-weight:600;padding:8px 14px;color:var(--tram);list-style:none}
.quy-uoc>summary::-webkit-details-marker,.boi-canh>summary::-webkit-details-marker{display:none}
.quy-uoc>summary::before,.boi-canh>summary::before{content:"+";display:inline-grid;place-items:center;width:22px;height:22px;margin-right:10px;border-radius:50%;background:var(--tram);color:var(--trang);font-weight:700;flex:none}
.quy-uoc[open]>summary::before,.boi-canh[open]>summary::before{content:"−"}
.quy-uoc ul{margin:0;padding:4px 16px 4px 34px;display:grid;gap:8px;font-size:.93rem;line-height:1.6}
.qu-nguon{font-size:.82rem;color:var(--chu-phu);padding:8px 16px 14px;margin:0}
.cho-xn{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;background:#FFF1C2;color:#5A4300;border:1px solid #D9B43A;border-radius:6px;padding:1px 7px;margin-left:4px;vertical-align:1px;white-space:nowrap}
.cho-nhap{border:1.5px dashed color-mix(in srgb,var(--tram) 35%,transparent);border-radius:14px;padding:16px 18px;margin-top:14px;background:color-mix(in srgb,var(--trang) 80%,transparent)}
.cho-nhap p{margin:0;color:var(--chu-phu)}
.dung-lai{border-left:5px solid #B4532A;background:#FFF6EF;color:#3B2416;border-radius:12px;padding:16px 18px;margin-top:14px}
.dung-lai .dl-dau{font-weight:700;font-size:1.05rem;margin:0 0 6px;color:#7A2E0E}
.dung-lai .dl-nhan{font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin:10px 0 2px;color:#7A2E0E}
.dung-lai ul{margin:0;padding-left:20px}
.dung-lai p{margin:0}
.dung-lai .hai-kq{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:10px;margin-top:10px}
.dung-lai .hai-kq div{background:#fff;border-radius:10px;padding:10px 12px;border:1px solid #EBCDB8}
.dung-lai .hai-kq b{display:block;font-size:1.15rem;color:#3B2416}
.loi-khuyen li>span small.lop{display:block;font-size:.68rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;opacity:.75;margin-top:2px}
.boi-canh{margin:4px 0 10px;border-top:1px dashed color-mix(in srgb,var(--tram) 30%,transparent)}
.boi-canh>summary{padding-left:0}
.boi-canh .bc{display:grid;gap:10px;padding:2px 0 8px;font-size:.95rem;line-height:1.65}
.boi-canh .bc p{margin:0}
.boi-canh .bc b{color:var(--tram)}
.kq-hai{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));gap:12px;margin-top:14px}
/* Trang chủ: chọn môn theo dữ liệu đang có */
.chon-mon{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.chon-mon a{display:grid;gap:6px;background:var(--trang);border-radius:16px;padding:18px;text-decoration:none;color:var(--tram);border:1px solid color-mix(in srgb,var(--dong) 40%,transparent);min-height:44px}
.chon-mon a:hover,.chon-mon a:focus-visible{border-color:var(--dong);box-shadow:0 6px 18px rgba(0,0,0,.08)}
.chon-mon .cm-co{font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--dong-dam)}
.chon-mon b{font-size:1.15rem}
.chon-mon span.cm-mon{font-size:.93rem;color:var(--chu-phu)}
@media (max-width:860px){.chon-mon{grid-template-columns:1fr}}
.gioi-thieu{max-width:760px;margin:0 auto;background:var(--trang);border-radius:18px;padding:26px 24px;display:grid;gap:12px;font-size:1.02rem;line-height:1.75}
.gioi-thieu p{margin:0}
.gioi-thieu .ky{font-family:var(--f-tieude);font-size:1.3rem;font-weight:700;color:var(--dong-dam);text-align:right}
/* Mobile-first: chạm dễ, không tràn ngang */
input,select,button{font-size:16px}
.cong-cu input,.cong-cu select{min-height:44px}
label.chon{min-height:44px;display:inline-flex;align-items:center;gap:10px}
label.chon input{width:22px;height:22px;min-height:0}
html,body{overflow-x:hidden}
@media (max-width:430px){
  .cong-cu .hang{flex-direction:column;align-items:stretch}
  .cong-cu .truong{width:100%;min-width:0;flex:none!important}
  .cong-cu input,.cong-cu select{width:100%}
  .gioi-thieu{padding:20px 16px}
}