/* ============================================================
   9 CHUM · nguyenvankhanh.vn — trình bày dùng chung mọi trang
   Sửa file này = đổi cả web. Đừng chép CSS vào từng trang.
   Bảng màu lấy từ file logo, không đoán. Tỷ lệ 60-30-10.
   ============================================================ */
:root{
  --den:#12100E; --den2:#1E1915; --vien:#2E2621;
  --kem:#F4ECE0; --xam:#9C9088;
  --vang:#FDB91A; --hophach:#C9822A;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--den);color:var(--kem);
  font-family:"Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
.bo{width:100%;max-width:1180px;margin:0 auto;padding:0 22px}

/* --- thanh trên cùng --- */
.top{position:fixed;top:0;left:0;right:0;z-index:50;padding:13px 0;
  background:linear-gradient(to bottom,rgba(18,16,14,.94),rgba(18,16,14,0))}
.top.dac{background:rgba(18,16,14,.97);border-bottom:1px solid var(--vien)}
.top .bo{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--kem);
  font-weight:700;font-size:15.5px;letter-spacing:.01em}
.logo img{width:34px;height:34px;border-radius:50%}
.logo span{color:var(--vang)}
.top nav{display:flex;gap:20px;font-size:14.5px}
.top nav a{color:var(--kem);opacity:.8;text-decoration:none;white-space:nowrap}
.top nav a:hover,.top nav a.dang{opacity:1;color:var(--vang)}

/* nút ba gạch — chỉ hiện trên máy nhỏ */
.mo-menu{display:none;background:none;border:0;cursor:pointer;padding:8px;
  color:var(--kem);font:inherit;line-height:0}
.mo-menu span{display:block;width:24px;height:2px;background:currentColor;margin:5px 0;
  transition:transform .2s,opacity .2s}
.top.bung .mo-menu span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.top.bung .mo-menu span:nth-child(2){opacity:0}
.top.bung .mo-menu span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media(max-width:1000px){
  .mo-menu{display:block;color:var(--vang)}
  .top{background:rgba(18,16,14,.97);border-bottom:1px solid var(--vien)}
  .top .bo{flex-wrap:wrap}
  .top nav{display:none;width:100%;flex-direction:column;gap:0;
    margin-top:13px;border-top:1px solid var(--vien)}
  .top.bung nav{display:flex}
  .top nav a{opacity:1;padding:15px 2px;border-bottom:1px solid var(--vien);font-size:16px}
  .top nav a.dang{color:var(--vang)}
  .logo{font-size:14px}
  .logo img{width:30px;height:30px}
}

/* --- hero trang chủ --- */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden}
.hero>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero .phu{position:absolute;inset:0;
  background:linear-gradient(to top,rgba(18,16,14,.97) 6%,rgba(18,16,14,.6) 46%,rgba(18,16,14,.3))}
.hero .bo{position:relative;padding:130px 22px 62px}

/* --- đầu trang con: không ảnh nền, gọn hơn hero --- */
.dau{padding:132px 0 clamp(46px,7vw,78px);border-bottom:1px solid var(--vien);background:var(--den2)}
.dau h1{max-width:20ch}
.dau .dan{margin-top:18px}

.nhan{display:inline-flex;align-items:center;gap:10px;font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--vang);margin-bottom:20px}
.nhan::before{content:"";width:36px;height:2px;background:var(--vang)}
h1{font-size:clamp(2.5rem,7.6vw,5.4rem);line-height:1.02;font-weight:700;
  letter-spacing:-.028em;max-width:14ch}
h1 em{font-style:normal;color:var(--vang)}
.hero p{margin-top:22px;font-size:clamp(1.02rem,2.2vw,1.28rem);max-width:45ch;color:#E4D9CA}

/* --- nút --- */
.nut-hang{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}
.nut{display:inline-block;padding:15px 32px;border-radius:3px;text-decoration:none;
  font-weight:700;font-size:15.5px;background:var(--vang);color:var(--den);border:2px solid var(--vang)}
.nut:hover{background:#FFC94A;border-color:#FFC94A}
.nut.rong{background:transparent;color:var(--kem);border-color:rgba(244,236,224,.35)}
.nut.rong:hover{background:rgba(244,236,224,.09);border-color:var(--kem)}

/* --- dải số --- */
.so-dai{border-top:1px solid var(--vien);border-bottom:1px solid var(--vien);background:var(--den2)}
.so-luoi{display:grid;grid-template-columns:repeat(4,1fr)}
.so-o{padding:46px 20px;border-right:1px solid var(--vien)}
.so-o:last-child{border-right:0}
.so-o .n{font-size:clamp(2rem,5vw,3.6rem);font-weight:700;color:var(--vang);
  line-height:1;letter-spacing:-.035em}
.so-o .n small{font-size:.42em;font-weight:600;letter-spacing:0;color:var(--hophach)}
.so-o .t{margin-top:11px;font-size:13.5px;color:var(--xam);line-height:1.45}
@media(max-width:800px){
  .so-luoi{grid-template-columns:repeat(2,1fr)}
  .so-o{border-bottom:1px solid var(--vien);padding:30px 18px}
  .so-o:nth-child(2n){border-right:0}}

/* --- khối chữ --- */
section{padding:clamp(66px,9vw,124px) 0}
section.hep{padding:clamp(48px,6vw,86px) 0}
.tieu{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--vang);margin-bottom:17px}
h2{font-size:clamp(1.85rem,4.6vw,3.15rem);line-height:1.12;font-weight:700;
  letter-spacing:-.022em;max-width:21ch}
h2 em{font-style:normal;color:var(--vang)}
.dan{margin-top:20px;color:#DED3C4;max-width:56ch;font-size:1.05rem}
.dan+.dan{margin-top:14px}
.dan b{color:var(--kem)}
.dan a{color:var(--vang)}

.doi{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(30px,5vw,70px);align-items:center}
.doi.dao{grid-template-columns:.95fr 1.05fr}
.doi img{width:100%;height:clamp(320px,46vw,555px);object-fit:cover;border-radius:2px}
@media(max-width:880px){.doi,.doi.dao{grid-template-columns:1fr}.doi img{height:300px}}

.ba{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--vien);margin-top:54px}
.ba .o{background:var(--den);padding:0 0 34px}
.ba .o img{width:100%;height:210px;object-fit:cover;margin-bottom:26px}
.ba .o .noi{padding:0 28px}
.ba .o .stt{font-size:11.5px;color:var(--vang);letter-spacing:.2em;margin-bottom:13px}
.ba .o h3{font-size:1.22rem;font-weight:700;margin-bottom:11px;letter-spacing:-.012em}
.ba .o p{color:var(--xam);font-size:.96rem}
@media(max-width:880px){.ba{grid-template-columns:1fr}}

.tran{position:relative;height:clamp(360px,56vw,640px);overflow:hidden}
.tran img{width:100%;height:100%;object-fit:cover}
.tran .chu{position:absolute;inset:0;display:flex;align-items:flex-end;
  background:linear-gradient(to top,rgba(18,16,14,.94),rgba(18,16,14,.1) 62%)}
.tran .chu .bo{padding-bottom:54px}

/* --- 3 thẻ chọn đường --- */
.re{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:48px}
.re a{display:block;text-decoration:none;color:inherit;background:var(--den2);
  border:1px solid var(--vien);padding:34px 28px;transition:border-color .15s,transform .15s}
.re a:hover{border-color:var(--vang);transform:translateY(-2px)}
.re h3{font-size:1.14rem;margin-bottom:10px;font-weight:700}
.re p{color:var(--xam);font-size:.94rem;margin-bottom:20px}
.re .mui{color:var(--vang);font-size:.92rem;font-weight:700}
@media(max-width:880px){.re{grid-template-columns:1fr}}

/* --- khối vàng gọi điện --- */
.goi{background:var(--vang);color:var(--den)}
.goi h2{color:var(--den)}
.goi .dan{color:#4A3A0C;max-width:44ch}
.goi .dt{display:inline-block;margin-top:22px;font-size:clamp(1.9rem,5vw,2.9rem);
  font-weight:700;color:var(--den);text-decoration:none;letter-spacing:-.03em}
.goi .dt:hover{text-decoration:underline}
.goi .phu-nut{margin-top:18px;display:flex;gap:12px;flex-wrap:wrap}
.goi .phu-nut a{display:inline-block;padding:13px 26px;border-radius:3px;text-decoration:none;
  font-weight:700;font-size:15px;background:var(--den);color:var(--vang)}
.goi .phu-nut a:hover{background:#241E19}

/* --- CÂU HỎI: đóng mở --- */
.hoi{margin-top:44px;border-top:1px solid var(--vien)}
.hoi details{border-bottom:1px solid var(--vien)}
.hoi summary{cursor:pointer;list-style:none;padding:26px 44px 26px 0;position:relative;
  font-size:clamp(1.05rem,2.4vw,1.28rem);font-weight:700;letter-spacing:-.01em}
.hoi summary::-webkit-details-marker{display:none}
.hoi summary::after{content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);
  color:var(--vang);font-size:1.6rem;font-weight:400;line-height:1}
.hoi details[open] summary::after{content:"−"}
.hoi summary:hover{color:var(--vang)}
.hoi .tra{padding:0 44px 30px 0;color:#DED3C4;max-width:70ch}
.hoi .tra p+p{margin-top:13px}
.hoi .tra b{color:var(--kem)}

/* --- MỐC THỜI GIAN --- */
.moc{margin-top:56px;border-left:2px solid var(--vien);padding-left:clamp(22px,4vw,44px)}
.moc .o{position:relative;padding-bottom:clamp(38px,5vw,58px)}
.moc .o:last-child{padding-bottom:0}
.moc .o::before{content:"";position:absolute;left:calc(-1*clamp(22px,4vw,44px) - 7px);top:9px;
  width:12px;height:12px;border-radius:50%;background:var(--vang);border:3px solid var(--den)}
.moc .nam{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:700;color:var(--vang);
  line-height:1;letter-spacing:-.03em;margin-bottom:12px}
.moc h3{font-size:1.16rem;font-weight:700;margin-bottom:9px}
.moc p{color:var(--xam);max-width:58ch;font-size:.99rem}

/* --- LƯỚI VIDEO --- */
.vid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:48px}
.vid a{display:block;text-decoration:none;color:inherit;background:var(--den2);
  border:1px solid var(--vien);transition:border-color .15s,transform .15s}
.vid a:hover{border-color:var(--vang);transform:translateY(-2px)}
.vid .khung{position:relative;aspect-ratio:3/4;background:#0C0A09;overflow:hidden}
.vid .khung img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vid a:hover .khung img{transform:scale(1.04)}
/* nút play chồng lên ảnh bìa */
.vid .khung::after{content:"";position:absolute;left:50%;top:50%;width:54px;height:54px;
  transform:translate(-50%,-50%);border-radius:50%;background:rgba(18,16,14,.62);
  border:2px solid rgba(244,236,224,.85);pointer-events:none}
.vid .khung::before{content:"";position:absolute;left:calc(50% + 3px);top:50%;z-index:1;
  transform:translate(-50%,-50%);border-style:solid;border-width:9px 0 9px 15px;
  border-color:transparent transparent transparent #F4ECE0;pointer-events:none}
.vid .khung .trong{display:flex;align-items:center;justify-content:center;height:100%;
  color:#4A423C;font-size:13px;text-align:center;padding:20px}
.vid .noi{padding:18px 20px 22px}
.vid h3{font-size:1.02rem;font-weight:700;margin-bottom:7px;line-height:1.35}
.vid .meta{color:var(--vang);font-size:.85rem;font-weight:700}
@media(max-width:880px){.vid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.vid{grid-template-columns:1fr}}

/* --- LƯỚI SẢN PHẨM (ảnh tách nền) --- */
.sp{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--vien);margin-top:52px}
.sp .o{background:var(--den);padding:34px 28px 32px;display:flex;flex-direction:column}
.sp .anh{height:230px;display:flex;align-items:center;justify-content:center;margin-bottom:24px;
  background:radial-gradient(ellipse at 50% 78%,rgba(253,185,26,.13),transparent 66%)}
.sp .anh img{max-height:230px;width:auto;object-fit:contain}
.sp .anh .trong{color:#4A423C;font-size:13px;text-align:center;padding:0 18px}
.sp h3{font-size:1.2rem;font-weight:700;margin-bottom:10px;letter-spacing:-.012em}
.sp p{color:var(--xam);font-size:.96rem;margin-bottom:16px}
.sp .quy{margin-top:auto;padding-top:16px;border-top:1px solid var(--vien);
  color:var(--hophach);font-size:.88rem;font-weight:700;letter-spacing:.02em}
@media(max-width:980px){.sp{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.sp{grid-template-columns:1fr}}

/* --- BƯỚC ĐÁNH SỐ (trang liên hệ) --- */
.buoc{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--vien);margin-top:40px}
.buoc .o{background:var(--den);padding:30px 26px}
.buoc .stt{font-size:11.5px;color:var(--vang);letter-spacing:.2em;margin-bottom:12px}
.buoc h3{font-size:1.08rem;font-weight:700;margin-bottom:9px}
.buoc p{color:var(--xam);font-size:.95rem}
@media(max-width:880px){.buoc{grid-template-columns:1fr}}

/* --- khối nhánh trang liên hệ --- */
.nhanh{border-top:1px solid var(--vien);padding-top:clamp(48px,6vw,80px);margin-top:clamp(48px,6vw,80px)}
.nhanh:first-of-type{border-top:0;padding-top:0;margin-top:0}

/* --- gạch đầu dòng có dấu tick --- */
.tick{margin-top:26px;max-width:60ch}
.tick li{list-style:none;position:relative;padding-left:28px;margin-bottom:13px;color:#DED3C4}
.tick li::before{content:"";position:absolute;left:0;top:.62em;width:11px;height:2px;background:var(--vang)}
.tick li b{color:var(--kem)}

/* --- ô ghi chú vàng nhạt --- */
.luu{margin-top:30px;border-left:3px solid var(--vang);background:var(--den2);
  padding:20px 24px;max-width:62ch;color:#DED3C4;font-size:.98rem}
.luu b{color:var(--kem)}

/* --- chân trang --- */
footer{background:var(--den2);border-top:1px solid var(--vien);padding:56px 0 34px;
  font-size:14.5px;color:var(--xam)}
footer .cot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:34px}
footer b{color:var(--kem);display:block;margin-bottom:10px;font-size:15px}
footer a{color:var(--vang);text-decoration:none}
.canh{margin-top:38px;padding-top:22px;border-top:1px solid var(--vien);
  font-size:12.5px;line-height:1.6;color:#786C63}
@media(max-width:800px){footer .cot{grid-template-columns:1fr;gap:26px}}

/* --- NÚT ZALO NỔI — theo màn hình, luôn trong tầm ngón tay --- */
.zalo-noi{position:fixed;right:18px;bottom:18px;z-index:90;
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 20px 13px 16px;border-radius:40px;text-decoration:none;
  background:var(--vang);color:var(--den);font-weight:700;font-size:15px;
  box-shadow:0 6px 22px rgba(0,0,0,.45);transition:transform .15s,background .15s}
.zalo-noi:hover{background:#FFC94A;transform:translateY(-2px)}
.zalo-noi svg{width:22px;height:22px;flex:0 0 auto}
.zalo-noi .nho{display:block;font-weight:600;font-size:11.5px;opacity:.72;letter-spacing:.01em}
@media(max-width:620px){
  .zalo-noi{right:14px;bottom:14px;padding:12px 18px 12px 14px;font-size:14px}
  .zalo-noi .nho{display:none}
}

/* --- cổng 18+ --- */
#cong18{position:fixed;inset:0;z-index:999;background:#12100E;display:flex;
  align-items:center;justify-content:center;padding:24px;text-align:center}
#cong18 .h{max-width:480px}
#cong18 img{width:72px;height:72px;margin:0 auto 26px}
#cong18 h2{font-size:clamp(1.4rem,4vw,2rem);color:#F4ECE0;margin-bottom:14px;max-width:none}
#cong18 p{color:#9C9088;font-size:.97rem;margin-bottom:28px;line-height:1.6}
#cong18 .hang{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
#cong18 button{font:inherit;font-weight:700;font-size:15px;padding:14px 30px;
  border-radius:3px;cursor:pointer;border:2px solid #FDB91A}
#cong18 .co{background:#FDB91A;color:#12100E}
#cong18 .khong{background:transparent;color:#F4ECE0;border-color:rgba(244,236,224,.3)}
#cong18 small{display:block;margin-top:24px;color:#6E635B;font-size:12px;line-height:1.55}


/* --- khối hình + chữ xen kẽ (trang Nhà máy) --- */
.doan{display:grid;grid-template-columns:1.02fr .98fr;gap:clamp(28px,5vw,66px);align-items:center}
.doan.dao{direction:rtl}
.doan.dao>*{direction:ltr}
.doan img{width:100%;height:clamp(300px,44vw,520px);object-fit:cover}
.doan .so{display:inline-block;font-size:12px;letter-spacing:.2em;color:var(--den);
  background:var(--vang);padding:5px 12px;font-weight:700;margin-bottom:16px}
section+section .doan{border-top:1px solid var(--vien);padding-top:clamp(50px,7vw,90px)}
.chuoi{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--vien)}
.chuoi figure{background:var(--den);margin:0}
.chuoi img{width:100%;height:240px;object-fit:cover}
.chuoi figcaption{padding:16px 20px 22px;font-size:.93rem;color:var(--xam)}
.chuoi b{display:block;color:var(--kem);font-size:1.02rem;margin-bottom:5px}
@media(max-width:880px){.doan,.doan.dao{grid-template-columns:1fr}.doan img{height:280px}}
@media(max-width:880px){.chuoi{grid-template-columns:1fr}}