:root{
  /* MAU CHINH: do tram, chi dung cho hanh dong va diem nhan cau truc */
  --do:#b31219;
  --do-dam:#8c0e14;
  /* MAU PHU: vang dong tram, chi dung cho so lieu va nhan nho */
  --vang:#c9a24a;
  --vang-sang:#dcb663;
  /* NEN: ba sac do than chi, khong dung den tuyet doi */
  --nen:#1d1e21;
  --nen-2:#25262a;
  --nen-3:#2d2e33;
  --nen-dau:#17181b;
  --do-khoi:#5c1015;
  /* CHU */
  --muc:#e6e5e7;
  --muc-nhat:#9b9ba2;
  --vien:#383940;
  --rong:1140px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:78px;background:var(--nen)}
body{
  margin:0;background:var(--nen);color:var(--muc);
  font-family:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif;
  font-size:17px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--vang-sang)}
strong{color:#fff}
.bo{width:100%;max-width:var(--rong);margin:0 auto;padding:0 20px}

/* ---------- tiêu đề ---------- */
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0;color:#fff}
h1{font-size:clamp(27px,5vw,50px);font-weight:800}
h2{font-size:clamp(23px,3.6vw,36px);font-weight:800}
h3{font-size:19px;font-weight:700;letter-spacing:-.01em}
.tua{position:relative;margin-bottom:38px;padding-bottom:20px;border-bottom:1px solid var(--vien)}
.tua h2{max-width:22ch}
.tua p{margin:12px 0 0;color:var(--muc-nhat);max-width:62ch}
.tua::after{content:"";position:absolute;left:0;bottom:-1px;width:68px;height:2px;background:var(--do)}

/* ---------- đầu trang ---------- */
.dau{position:sticky;top:0;z-index:50;background:var(--nen-dau);border-bottom:2px solid var(--do)}
.dau .bo{display:flex;align-items:center;gap:26px;height:64px}
.dau-logo{display:flex;align-items:center;text-decoration:none;flex-shrink:0}
.dau-logo img{height:18px;width:auto}
.dau nav{margin-left:auto;display:flex;gap:22px}
.dau nav a{
  color:#d9d8dc;text-decoration:none;font-size:15px;font-weight:600;
  padding:6px 0;border-bottom:2px solid transparent;white-space:nowrap
}
.dau nav a:hover,.dau nav a:focus-visible{color:#fff;border-bottom-color:var(--do)}
.dau nav a.chi-mobile{display:none}
.nut-goi{
  background:var(--do);color:#fff!important;text-decoration:none;font-weight:700;
  padding:10px 18px;border-radius:2px;font-size:15px;white-space:nowrap
}
.nut-goi:hover{background:var(--do-dam)}
.mo-menu{display:none;margin-left:auto;background:none;border:1px solid rgba(255,255,255,.4);
  padding:9px 13px;border-radius:2px;font-size:15px;font-weight:600;cursor:pointer;color:#fff}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--nen);overflow:hidden}
.hero img.nen{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(23,24,27,.95) 0%,rgba(27,25,28,.86) 45%,rgba(45,30,32,.52) 100%)
}
.hero .bo{position:relative;z-index:1;padding-top:84px;padding-bottom:80px}
.hero h1{max-width:19ch}
.hero p{max-width:56ch;font-size:clamp(16px,2vw,19px);margin:20px 0 0;color:#dcdade}
.hero-nut{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero-nut a{text-decoration:none;font-weight:700;padding:14px 26px;border-radius:2px;font-size:16px}
.hero-nut a:first-child{background:var(--do);color:#fff}
.hero-nut a:first-child:hover{background:var(--do-dam)}
.hero-nut a+a{border:1px solid rgba(255,255,255,.45);color:#fff}
.hero-nut a+a:hover{background:rgba(255,255,255,.1);border-color:#fff}

/* ---------- dải số liệu ---------- */
.solieu{background:var(--nen-dau);border-bottom:1px solid var(--vien)}
.solieu ul{
  list-style:none;margin:0 auto;padding:26px 20px;display:grid;gap:22px;
  grid-template-columns:repeat(5,1fr);max-width:var(--rong)
}
.solieu b{display:block;font-size:26px;font-weight:800;color:var(--vang);line-height:1.15}
.solieu span{font-size:14px;color:var(--muc-nhat);display:block;margin-top:2px}

/* ---------- khối chung ---------- */
section{padding:72px 0}
section.xam{background:var(--nen-2)}
.hai-cot{display:grid;grid-template-columns:1.1fr .9fr;gap:52px;align-items:start}
.hai-cot p{margin:0 0 16px}
.hai-cot figure{margin:0;position:sticky;top:84px}
.hai-cot figure img{border:1px solid var(--vien)}
.hai-cot figcaption{font-size:14px;color:var(--muc-nhat);margin-top:10px}

/* ---------- dịch vụ ---------- */
.dv{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.dv article{border:1px solid var(--vien);background:var(--nen-3);display:flex;flex-direction:column}
.dv img{aspect-ratio:16/10;object-fit:cover;width:100%}
.dv .noi{padding:24px;display:flex;flex-direction:column;flex:1}
.dv h3{margin-bottom:10px}
.dv p{margin:0 0 14px;color:var(--muc-nhat);font-size:16px}
.dv ul{margin:0 0 20px;padding-left:20px;font-size:15px;color:var(--muc-nhat)}
.dv ul li{margin-bottom:3px}
.dv a.xem{
  margin-top:auto;align-self:flex-start;font-weight:700;color:var(--vang);
  text-decoration:none;border-bottom:1px solid var(--do);padding-bottom:4px;font-size:15px
}
.dv a.xem:hover{color:var(--vang-sang)}

/* ---------- công trình ---------- */
.nhom{margin-bottom:46px}
.nhom:last-child{margin-bottom:0}
.nhom h3{
  position:relative;font-size:16px;font-weight:700;color:#fff;margin-bottom:18px;
  padding-bottom:10px;border-bottom:1px solid var(--vien)
}
.nhom h3::after{content:"";position:absolute;left:0;bottom:-1px;width:44px;height:2px;background:var(--do)}
.luoi{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.luoi figure{margin:0}
.luoi img{width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--nen-3);border:1px solid var(--vien)}
.luoi figcaption{font-size:15px;font-weight:600;margin-top:10px;line-height:1.45;color:#d9d8dc}

/* ---------- danh sách dự án ---------- */
.duan{columns:2;column-gap:44px;margin:0;padding:0;list-style:none}
.duan li{
  break-inside:avoid;padding:10px 0 10px 26px;position:relative;
  border-bottom:1px solid var(--vien);font-size:16px;line-height:1.6;color:#d3d2d7
}
.duan li::before{
  content:"";position:absolute;left:0;top:20px;width:9px;height:9px;
  background:var(--do);transform:rotate(45deg)
}

/* ---------- khối giải thưởng ---------- */
.thuong{background:var(--do-khoi)}
.thuong .tua{border-bottom-color:rgba(255,255,255,.26)}
.thuong .tua::after{background:var(--vang)}
.thuong .tua p{color:#e8cfcf}
.thuong .cot{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.thuong h3{color:var(--vang);font-size:17px;margin-bottom:14px}
.thuong ol{margin:0;padding-left:22px;color:#fff}
.thuong li{margin-bottom:11px;line-height:1.6;font-size:16px}
.thuong li::marker{color:var(--vang);font-weight:700}

/* ---------- khách hàng ---------- */
.kh{display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0;list-style:none}
.kh li{border:1px solid var(--vien);background:var(--nen-2);padding:9px 16px;font-size:15px;font-weight:600}

/* ---------- liên hệ ---------- */
.lh{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.lh dl{margin:0}
.lh dt{font-size:14px;color:var(--muc-nhat);margin-top:20px}
.lh dt:first-child{margin-top:0}
.lh dd{margin:2px 0 0;font-size:18px;font-weight:600;color:#fff}
.lh dd a{color:#fff;text-decoration:none}
.lh dd a:hover{color:var(--vang)}
.lh .nut{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.lh .nut a{text-decoration:none;font-weight:700;padding:13px 24px;border-radius:2px;font-size:16px}
.lh .nut a:first-child{background:var(--do);color:#fff}
.lh .nut a:first-child:hover{background:var(--do-dam)}
.lh .nut a+a{border:1px solid rgba(255,255,255,.45);color:#fff}
.lh .nut a+a:hover{background:rgba(255,255,255,.1);border-color:#fff}
.lh iframe{width:100%;height:340px;border:1px solid var(--vien);filter:saturate(.9)}

/* ---------- chân trang ---------- */
footer{background:var(--nen-dau);color:#9b9ba2;padding:50px 0 28px;font-size:15px;border-top:1px solid var(--vien)}
footer a{color:#e6e5e7;text-decoration:none}
footer a:hover{color:var(--vang)}
.chan{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:38px}
.chan h4{color:#fff;font-size:15px;margin:0 0 12px;font-weight:700}
.chan ul{list-style:none;margin:0;padding:0}
.chan li{margin-bottom:7px}
.chan-cuoi{border-top:1px solid var(--vien);margin-top:36px;padding-top:22px;font-size:14px;color:#77777e}

/* ---------- trang con ---------- */
.duongdan{font-size:14px;color:var(--muc-nhat);padding:18px 0 0}
.duongdan a{color:var(--muc-nhat)}
.trangcon-dau{padding:30px 0 8px}
.trangcon-dau p.mo{font-size:19px;color:var(--muc-nhat);max-width:62ch;margin:18px 0 0}
.anh-lon{margin:34px 0 0}
.anh-lon img{width:100%;aspect-ratio:2/1;object-fit:cover;border:1px solid var(--vien)}
.noidung h2{margin-top:44px;margin-bottom:16px;font-size:26px}
.noidung h2:first-child{margin-top:0}
.noidung p{margin:0 0 16px;max-width:70ch;color:#d3d2d7}
.noidung ul{padding-left:22px;margin:0 0 16px;max-width:70ch;color:#d3d2d7}
.noidung li{margin-bottom:7px}
.cta{background:var(--nen-2);border-left:4px solid var(--do);padding:26px 28px;margin-top:44px}
.cta p{margin:0 0 16px;font-weight:600;font-size:18px;color:#fff}
.cta a{background:var(--do);color:#fff;text-decoration:none;font-weight:700;padding:12px 22px;border-radius:2px;display:inline-block}
.cta a:hover{background:var(--do-dam)}

/* ---------- thanh gọi cố định trên điện thoại ---------- */
.thanh-goi{display:none}

:focus-visible{outline:3px solid var(--vang);outline-offset:2px}

@media (max-width:900px){
  .dau .bo{gap:14px}
  .dau nav{
    display:none;position:absolute;top:64px;left:0;right:0;background:var(--nen-dau);
    flex-direction:column;gap:0;padding:8px 20px 18px;border-bottom:2px solid var(--do);
    max-height:calc(100vh - 64px);overflow-y:auto
  }
  .dau nav.mo{display:flex}
  .dau nav a{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.14)}
  .dau nav a.chi-mobile{
    display:block;background:var(--do);color:#fff;text-align:center;
    margin-top:14px;padding:14px 0;border:0;border-radius:2px;font-weight:700
  }
  .mo-menu{display:block}
  .dau .nut-goi{display:none}

  .hai-cot,.thuong .cot,.lh{grid-template-columns:1fr;gap:30px}
  .dv{grid-template-columns:1fr}
  .luoi{grid-template-columns:repeat(2,1fr)}
  .solieu ul{grid-template-columns:repeat(2,1fr);gap:18px}
  .duan{columns:1}
  .chan{grid-template-columns:1fr 1fr}

  body{padding-bottom:64px}
  .thanh-goi{
    display:grid;grid-template-columns:1fr 1fr;position:fixed;left:0;right:0;bottom:0;z-index:60;
    border-top:1px solid rgba(255,255,255,.18)
  }
  .thanh-goi a{
    text-decoration:none;text-align:center;font-weight:700;font-size:16px;
    padding:17px 0;color:#fff;background:var(--do)
  }
  .thanh-goi a+a{background:var(--nen-dau);color:#fff}
}
@media (max-width:560px){
  body{font-size:16px}
  section{padding:48px 0}
  .hero .bo{padding-top:56px;padding-bottom:54px}
  .luoi{grid-template-columns:1fr}
  .chan{grid-template-columns:1fr}
  .anh-lon img{aspect-ratio:3/2}
  .hero-nut{display:none}
  .lh .nut a{flex:1 1 100%;text-align:center}
  .cta a{display:block;text-align:center;margin:0 0 10px!important}
  .thuong ol{padding-left:20px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}