/* ========== HỆ MÀU (xanh navy + vàng gold, lấy từ logo Gia Long) ========== */
:root{
  --navy-dark:#0A1545;      /* header, footer, tiêu đề */
  --navy-bar:#14235F;       /* topbar, ô tìm kiếm, dải bản quyền */
  --navy:#1B307C;           /* viền, tiêu đề bảng, link */
  --navy-mid:#24409B;       /* nút chính, viền nhấn */
  --gold:#D4AF37;           /* gạch chân tiêu đề, nút CTA, chữ nhấn trên nền xanh */
  --gold-deep:#B8912A;      /* hover của nút vàng */
  --gold-soft:#FBF4DE;      /* nền nhạt ô icon, ô thông báo */
  --navy-soft:#F1F4FC;      /* nền nhạt khi rê chuột trong menu */
  --red:#D32F2F;            /* số tiền, hotline */
  --ink:#333333;
  --ink-2:#666666;
  --bg:#FFFFFF;
  --bg-2:#F5F5F5;
  --bd:#E3E3E3;
  --wrap:1170px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
/* header dính cao 100px (76px trên mobile): chừa chỗ để mục được cuộn tới không bị che */
[id]{scroll-margin-top:112px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Roboto,"Helvetica Neue",Arial,sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:Roboto,Arial,sans-serif;font-weight:700;line-height:1.3;margin:0;color:var(--navy-dark)}
p{margin:0 0 1em}
a{color:var(--navy);text-decoration:none}
a:hover{color:var(--navy-mid)}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 15px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.btn{display:inline-block;background:var(--navy-mid);color:#fff;font-weight:700;font-size:14px;letter-spacing:.03em;
  text-transform:uppercase;padding:12px 26px;border-radius:3px;border:0;cursor:pointer;line-height:1.4}
.btn:hover{background:var(--navy-dark);color:#fff}
.btn-o{background:transparent;border:2px solid #fff;color:#fff;padding:10px 24px}
.btn-o:hover{background:#fff;color:var(--navy-dark)}
.btn-gold{background:var(--gold);color:var(--navy-dark)}
.btn-gold:hover{background:var(--gold-deep);color:var(--navy-dark)}

/* ================= TOP BAR ================= */
.top{background:var(--navy-bar);color:rgba(255,255,255,.88);font-size:13px}
.top .wrap{display:flex;justify-content:space-between;gap:12px;padding:7px 15px;flex-wrap:wrap}
.top a{color:rgba(255,255,255,.88)}
.top a:hover{color:var(--gold)}
.top .r{display:flex;gap:18px}

/* ================= HEADER ================= */
header{background:var(--navy-dark);position:sticky;top:0;z-index:90;box-shadow:0 2px 6px rgba(0,0,0,.18)}
.hd{display:flex;align-items:center;gap:18px;height:100px}
.brand{display:flex;align-items:center;gap:12px}
/* logo.svg là bản vẽ vector, nền trong suốt — không cần cắt */
.mark{height:84px;width:auto;flex:0 0 auto}
.brand .txt{display:block}
.brand b{display:block;color:#fff;font-weight:900;font-size:26px;letter-spacing:.055em;line-height:1;
  padding-bottom:8px;border-bottom:1px solid rgba(212,175,55,.5)}
.brand i{display:block;color:var(--gold);font-size:11px;letter-spacing:.33em;font-weight:700;
  font-style:normal;line-height:1;margin:7px -.33em 0 0}
nav{margin-left:auto;display:flex;align-items:center}
.ni{position:relative}
.ni>a{display:block;color:#fff;font-size:14px;font-weight:700;text-transform:uppercase;padding:12px 10px;letter-spacing:.01em}
.ni>a:hover,.ni:focus-within>a{color:var(--gold)}
.ni.has>a::after{content:"";display:inline-block;width:5px;height:5px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);margin-left:7px}
.sub{position:absolute;top:100%;left:0;min-width:262px;background:#fff;border-top:3px solid var(--navy-mid);
  box-shadow:0 6px 18px rgba(0,0,0,.18);padding:6px 0;display:none;z-index:5}
.ni:hover .sub,.ni:focus-within .sub{display:block}
.sub a{display:block;color:var(--ink);font-size:14px;padding:9px 18px;border-bottom:1px solid #F0F0F0}
.sub a:last-child{border-bottom:0}
.sub a:hover{background:var(--navy-soft);color:var(--navy)}
.hd .call{margin-left:12px;background:var(--gold);color:var(--navy-dark);font-weight:700;font-size:14px;padding:10px 18px;border-radius:3px;white-space:nowrap;display:inline-flex;align-items:center;gap:8px}
.hd .call:hover{background:#fff;color:var(--navy-dark)}
.burger{display:none;margin-left:auto;background:none;border:1px solid rgba(255,255,255,.4);border-radius:3px;padding:9px 11px;cursor:pointer}
.burger i{display:block;width:20px;height:2px;background:#fff;margin:4px 0}

/* ================= BANNER ================= */
.hero{position:relative;background:var(--navy-dark)}
.slides{position:relative;height:clamp(290px,42vw,470px)}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .5s;display:grid;place-items:center;background-size:cover;background-position:center}
.slide.on{opacity:1}
/* slide có ảnh: phủ lớp navy để chữ trắng luôn đọc được */
.slide.img{background-position:center 55%}
.slide.img::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,21,69,.5),rgba(10,21,69,.72))}
@media (prefers-reduced-motion:reduce){.slide{transition:none}}
/* THAY ẢNH BANNER: đổi background thành url('banner-1.jpg') */
.s1{background:linear-gradient(100deg,#0A1545 0%,#24409B 55%,#0A1545 100%)}
.s2{background:linear-gradient(100deg,#0E1B52 0%,#2E4FAE 60%,#0E1B52 100%)}
.s3{background:linear-gradient(100deg,#0A1545 0%,#1B307C 60%,#0A1545 100%)}
.slide-in{position:relative;z-index:2;width:100%;max-width:var(--wrap);padding:0 15px;color:#fff;text-align:center}
.slide-in .k{color:var(--gold);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.1em;margin:0 0 12px}
.slide-in h2{color:#fff;font-size:clamp(24px,3.8vw,42px);font-weight:900;text-transform:uppercase;max-width:22ch;margin:0 auto;text-shadow:0 2px 10px rgba(0,0,0,.3)}
.slide-in .st{margin:16px auto 0;max-width:60ch;color:rgba(255,255,255,.92);font-size:16.5px}
.slide-in .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.dots{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:3}
.dots button{width:11px;height:11px;border-radius:50%;border:2px solid #fff;background:transparent;padding:0;cursor:pointer}
.dots button[aria-current="true"]{background:var(--gold);border-color:var(--gold)}

/* ================= TIÊU ĐỀ MỤC ================= */
.sec{padding:52px 0}
.sec.alt{background:var(--bg-2)}

.stitle{text-align:center;margin-bottom:34px}
.stitle h2{font-size:clamp(22px,2.8vw,30px);font-weight:900;text-transform:uppercase;letter-spacing:.01em}
.stitle .bar{width:70px;height:3px;background:var(--gold);margin:14px auto 0}
.stitle p{margin:16px auto 0;max-width:78ch;color:var(--ink-2);font-size:16px}

/* ================= GIỚI THIỆU H1 ================= */
.intro{padding:48px 0 10px;text-align:center}
.intro h1{font-size:clamp(21px,2.9vw,30px);font-weight:900;text-transform:uppercase;max-width:24ch;margin:0 auto}
.intro .bar{width:70px;height:3px;background:var(--gold);margin:14px auto 20px}
.intro p{max-width:80ch;margin:0 auto;color:var(--ink-2)}
.intro b a{font-weight:700}

/* 3 ô CTA nhanh */
.quick{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:32px}
.quick a{display:block;border:1px solid var(--bd);border-top:3px solid var(--navy-mid);border-radius:3px;padding:22px 18px;text-align:center;background:#fff;color:var(--ink)}
.quick a:hover{box-shadow:0 6px 18px rgba(0,0,0,.09);border-top-color:var(--gold)}
.quick svg{margin:0 auto 10px;color:var(--navy-mid)}
.quick b{display:block;color:var(--navy-dark);font-size:16px;text-transform:uppercase;font-weight:700}
.quick span{font-size:13.5px;color:var(--ink-2)}

/* ================= 4 SỐ LIỆU ================= */
.stats{background:var(--navy);color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);padding-top:0;padding-bottom:0}
.stats div{padding:30px 18px;text-align:center;border-left:1px solid rgba(255,255,255,.18)}
.stats div:first-child{border-left:0}
.stats b{display:block;font-size:30px;font-weight:900;color:var(--gold);line-height:1.1}
.stats span{display:block;margin-top:7px;font-size:14px;color:rgba(255,255,255,.9);line-height:1.5}

/* ================= DỊCH VỤ ================= */
.svc{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.svc article{background:#fff;border:1px solid var(--bd);border-radius:3px;padding:28px 22px;text-align:center}
.svc article:hover{box-shadow:0 8px 22px rgba(0,0,0,.1)}
.svc .ic{width:66px;height:66px;border-radius:50%;background:var(--gold-soft);display:grid;place-items:center;margin:0 auto 16px;color:var(--navy)}
.svc h3{font-size:17px;text-transform:uppercase;font-weight:700;min-height:44px}
.svc p{font-size:14.5px;color:var(--ink-2);margin:8px 0 0}

/* ================= BẢNG GIÁ ================= */
.tbl-wrap{overflow-x:auto;border:1px solid var(--bd);border-radius:3px;background:#fff}
table{width:100%;border-collapse:collapse;min-width:660px;font-size:15px}
th,td{text-align:left;padding:15px 16px;border-bottom:1px solid var(--bd);vertical-align:top}
thead th{background:var(--navy);color:#fff;font-size:14px;text-transform:uppercase;font-weight:700;border-bottom:0}
tbody th{font-weight:700;color:var(--navy-dark);width:32%}
tbody th span{display:block;font-weight:400;font-size:13px;color:var(--ink-2);margin-top:3px}
tbody tr:nth-child(even){background:#FAFAFA}
td.price{color:var(--red);font-weight:900;white-space:nowrap;font-size:16px}
tr:last-child td,tr:last-child th{border-bottom:0}
.note{font-size:14px;color:var(--ink-2);margin-top:14px;font-style:italic}

/* ================= DIỆN TÍCH ================= */
.area{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center}
.area h3{font-size:18px;text-transform:uppercase;margin-bottom:12px}
.area dl{margin:0 0 26px;font-size:15.5px}
.area dt{font-weight:500;float:left;clear:left;width:56%}
.area dd{margin:0 0 8px;padding-left:56%;color:var(--navy);font-weight:700}
.blueprint{width:100%;height:auto;background:#fff;border:1px solid var(--bd);border-radius:3px;padding:10px}
.bp-line{fill:none;stroke:var(--navy-dark);stroke-width:1.6}
.bp-thin{fill:none;stroke:rgba(10,21,69,.32);stroke-width:1}
.bp-dim{fill:none;stroke:var(--navy-mid);stroke-width:1}
.bp-fill{fill:rgba(36,64,155,.07)}
.bp-t{font-family:Roboto;font-size:11px;fill:#777}
.bp-t.hl{fill:var(--navy)}

/* ================= QUY TRÌNH ================= */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;list-style:none;padding:0;margin:0;counter-reset:s}
.steps li{counter-increment:s;background:#fff;border:1px solid var(--bd);border-radius:3px;padding:34px 22px 24px;text-align:center;position:relative}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;top:-19px;left:50%;transform:translateX(-50%);
  width:38px;height:38px;border-radius:50%;background:var(--navy-mid);color:#fff;font-weight:900;font-size:14px;display:grid;place-items:center}
.steps h3{font-size:16.5px;text-transform:uppercase;margin-top:6px}
.steps p{font-size:14.5px;color:var(--ink-2);margin:8px 0 0}

/* ================= MẪU NHÀ ================= */
.gal{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.gal figure{margin:0;background:#fff;border:1px solid var(--bd);border-radius:3px;overflow:hidden}
.gal figure:hover{box-shadow:0 8px 22px rgba(0,0,0,.1)}
/* khung ảnh vuông: vừa cả nhà phố (ảnh dọc) lẫn biệt thự (ảnh ngang) */
.gal img{width:100%;aspect-ratio:1/1;object-fit:cover}
.ph{aspect-ratio:1/1;display:grid;place-items:center;text-align:center;padding:10px;font-size:13px;color:var(--ink-2);
  background:repeating-linear-gradient(45deg,#F2F2F2,#F2F2F2 11px,#EAEAEA 11px,#EAEAEA 22px)}
.gal figcaption{padding:14px 16px;text-align:center}
.gal figcaption b{display:block;color:var(--navy-dark);font-size:15.5px;text-transform:uppercase}
.gal figcaption span{font-size:13.5px;color:var(--ink-2)}
.center{text-align:center;margin-top:30px}

/* ================= HỒ SƠ ================= */
.docs{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.docs a{display:block;background:#fff;border:1px solid var(--bd);border-top:3px solid var(--navy-mid);border-radius:3px;padding:24px 20px;color:var(--ink-2)}
.docs a:hover{box-shadow:0 8px 22px rgba(0,0,0,.1);border-top-color:var(--gold);color:var(--ink-2)}
.docs svg{color:var(--navy-mid);margin-bottom:12px}
.docs b{display:block;color:var(--navy-dark);font-size:16px;text-transform:uppercase;font-weight:700}
.docs span{display:block;font-size:14px;margin-top:7px;line-height:1.55}

/* ================= FAQ ================= */
details{background:#fff;border:1px solid var(--bd);border-radius:3px;margin-bottom:10px}
summary{cursor:pointer;list-style:none;padding:15px 46px 15px 18px;font-weight:700;color:var(--navy-dark);position:relative;font-size:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:18px;top:11px;font-size:22px;font-weight:400;color:var(--navy-mid)}
details[open] summary::after{content:"–"}
details p{margin:0;padding:0 18px 16px;color:var(--ink-2);font-size:15px}

/* ================= LIÊN HỆ ================= */
.contact{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}
form{display:grid;gap:13px}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:13px}
label{font-size:13.5px;font-weight:500;color:var(--ink-2);display:block;margin-bottom:5px}
input,select,textarea{width:100%;font:inherit;font-size:15px;padding:11px 13px;border:1px solid var(--bd);border-radius:3px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{border-color:var(--navy-mid)}
textarea{resize:vertical;min-height:84px}
.ok{display:none;background:var(--gold-soft);border-left:4px solid var(--gold-deep);padding:13px 15px;font-size:15px}
.ok.show{display:block}
.ok p{margin:0 0 8px}
#ok-msg{min-height:0;height:104px;margin-top:4px;font-size:13.5px;background:var(--bg-2)}
.info{background:#fff;border:1px solid var(--bd);border-top:3px solid var(--navy-mid);border-radius:3px;padding:6px 22px 18px}
.info dt{font-size:12.5px;color:var(--ink-2);padding-top:14px;font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.info dd{margin:2px 0 13px;font-size:16px;border-bottom:1px solid #F0F0F0;padding-bottom:13px;font-weight:500}
.info dd:last-child{border-bottom:0}
.info dd a{font-weight:700}
.info .hot{color:var(--red);font-weight:900;font-size:20px}

/* ================= DẢI LIÊN HỆ ================= */
.touch{background:var(--navy-mid);color:#fff}
.touch .wrap{display:grid;grid-template-columns:repeat(3,1fr);padding-top:0;padding-bottom:0}
.touch div{padding:26px 20px;text-align:center;border-left:1px solid rgba(255,255,255,.2)}
.touch div:first-child{border-left:0}
.touch b{display:block;font-size:20px;font-weight:900;color:#fff}
.touch b a{color:#fff}
.touch span{font-size:13.5px;color:rgba(255,255,255,.88)}

/* ================= FOOTER ================= */
footer{background:var(--navy-dark);color:rgba(255,255,255,.78);padding:44px 0 0;font-size:14.5px}
.fgrid{display:grid;grid-template-columns:1.25fr .85fr 1.05fr;gap:36px}
footer h4{color:#fff;font-size:15px;text-transform:uppercase;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--gold);display:inline-block}
footer a{color:rgba(255,255,255,.78)}
footer a:hover{color:var(--gold)}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin-bottom:7px;padding-left:14px;position:relative}
footer li::before{content:"";position:absolute;left:0;top:11px;width:5px;height:5px;background:var(--gold)}
.map{width:100%;height:185px;border:2px solid rgba(255,255,255,.2);border-radius:3px}
.legal{margin-top:34px;background:var(--navy-bar);color:rgba(255,255,255,.68);font-size:13.5px}
.legal .wrap{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;padding:14px 15px}

/* ================= NÚT NỔI ================= */
.float{position:fixed;left:14px;bottom:14px;z-index:95;display:flex;align-items:center;gap:10px}
.float a{border-radius:50%;display:grid;place-items:center;box-shadow:0 4px 14px rgba(0,0,0,.3);font-weight:700;font-size:12px}
.f-zalo{width:52px;height:52px;background:#0068FF;color:#fff}
.f-call{width:52px;height:52px;background:var(--gold);color:var(--navy-dark)}
.hotbar{position:fixed;right:14px;bottom:14px;z-index:95;background:var(--gold);color:var(--navy-dark);font-weight:700;
  font-size:14px;text-transform:uppercase;padding:13px 22px;border-radius:30px;box-shadow:0 4px 14px rgba(0,0,0,.3)}
.hotbar:hover{background:var(--gold-deep);color:var(--navy-dark)}

/* ================= RESPONSIVE ================= */
@media (max-width:1180px){
  nav{display:none;position:absolute;top:var(--hd-h,100px);left:0;right:0;background:var(--navy-dark);flex-direction:column;
    align-items:stretch;padding:6px 15px 14px;max-height:74vh;overflow:auto;box-shadow:0 8px 16px rgba(0,0,0,.2)}
  nav.open{display:flex}
  .ni>a{padding:13px 0;border-bottom:1px solid rgba(255,255,255,.15)}
  .sub{position:static;display:block;box-shadow:none;border:0;background:transparent;padding:0 0 8px 12px;min-width:0}
  .sub a{color:rgba(255,255,255,.8);border-bottom:0;padding:8px 0;font-size:13.5px}
  .sub a:hover{background:transparent;color:var(--gold)}
  .ni.has>a::after{float:right;margin-top:8px}
  .burger{display:block;order:1;margin-left:12px}
  .hd .call{margin-left:auto}
}
@media (max-width:1024px){
  .svc,.docs{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .area,.contact{grid-template-columns:1fr}
  .quick,.steps,.gal,.stats .wrap{grid-template-columns:1fr 1fr}
  .fgrid{grid-template-columns:1fr 1fr}
  .stats div:nth-child(3){border-left:0}
}
@media (max-width:720px){
  .hd .call{display:none}
  .burger{margin-left:auto}
  .hd{height:76px;--hd-h:76px}
  [id]{scroll-margin-top:88px}
  .mark{height:62px}
  .brand{gap:11px}
  .brand b{font-size:20px;padding-bottom:6px}
  .brand i{font-size:9.5px;letter-spacing:.26em;margin-top:5px;margin-right:-.26em}
  .quick,.steps,.gal,.stats .wrap,.svc,.docs,.touch .wrap,.fgrid,.f2{grid-template-columns:1fr}
  .stats div,.touch div{border-left:0;border-top:1px solid rgba(255,255,255,.2)}
  .stats div:first-child,.touch div:first-child{border-top:0}
  .sec{padding:40px 0}
  .hotbar{padding:11px 16px;font-size:13px}
}

/* ===== TIÊU ĐỀ TRANG CON ===== */
.page-head{background:var(--bg-2);border-bottom:1px solid var(--bd);padding:28px 0}
.page-head h1{font-size:clamp(21px,2.8vw,30px);font-weight:900;text-transform:uppercase}
.crumb{margin:8px 0 0;font-size:13.5px;color:var(--ink-2)}
.crumb a{color:var(--navy)}
.ni.cur>a{color:var(--gold)}
.prose{max-width:78ch;margin:0 auto 34px;text-align:center;color:var(--ink-2)}
/* dịch vụ dạng hàng ngang ở trang con */
.svc-row{display:grid;grid-template-columns:64px 1fr;gap:22px;background:#fff;border:1px solid var(--bd);
  border-left:3px solid var(--navy-mid);border-radius:3px;padding:26px 26px;margin-bottom:20px}
.svc-row .ic{width:64px;height:64px;border-radius:50%;background:var(--gold-soft);display:grid;place-items:center;color:var(--navy)}
.svc-row h3{font-size:18px;text-transform:uppercase}
.svc-row p{margin:8px 0 0;color:var(--ink-2);font-size:15px}
.svc-row ul{margin:12px 0 0;padding-left:20px;color:var(--ink-2);font-size:14.5px}
.svc-row li{margin-bottom:4px}
@media (max-width:720px){.svc-row{grid-template-columns:1fr;padding:22px 18px}}