:root{
  --navy:#a50f1a;--navy-2:#7c0a13;--ink:#2b1a1b;--muted:#6e5b5c;
  --yellow:#ffc700;--yellow-2:#ffe9a8;--green:#16a34a;
  --link:#b3121f;--hero-glow:#d92d3b;
  --bg:#fbf6f4;--card:#fff;--line:#ecdedb;--radius:16px;
  --shadow:0 6px 24px rgba(124,10,19,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;padding-bottom:76px}
img{max-width:100%;height:auto;display:block}
a{color:var(--link)}
h1,h2,h3{line-height:1.25;margin:0 0 .5em;color:var(--navy)}
h1{font-size:clamp(1.7rem,6vw,2.6rem);font-weight:800}
h2{font-size:clamp(1.35rem,4.5vw,1.9rem);font-weight:800}
h3{font-size:1.1rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
.narrow{max-width:760px}
section{padding:40px 0}
.muted{color:var(--muted)}
.small{font-size:.9rem}

/* header */
.top{position:sticky;top:0;z-index:20;background:var(--navy);color:#fff}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;line-height:1.1}
.brand .p{width:36px;height:36px;border-radius:10px;background:var(--yellow);color:var(--navy);display:grid;place-items:center;font-size:22px;font-weight:900;flex:none}
.brand small{display:block;font-weight:500;font-size:.72rem;opacity:.8}
.nav{display:none;gap:20px}
.nav a{color:#fff;text-decoration:none;font-weight:600;opacity:.9}
.nav a:hover{opacity:1;color:var(--yellow)}
.top-call{background:var(--yellow);color:var(--navy);text-decoration:none;font-weight:800;padding:8px 12px;border-radius:999px;white-space:nowrap;font-size:.95rem}

/* hero */
.hero{background:radial-gradient(1200px 400px at 80% -10%,var(--hero-glow) 0,transparent 60%),var(--navy);color:#fff;padding:32px 0 44px}
.hero h1{color:#fff}
.hero .lead{font-size:1.08rem;opacity:.92;max-width:560px}
.price-tag{display:inline-flex;align-items:baseline;gap:6px;background:var(--yellow);color:var(--navy);border-radius:14px;padding:6px 14px;font-weight:900;margin:4px 0 14px;transform:rotate(-2deg)}
.price-tag b{font-size:2.2rem;line-height:1}
.hero-grid{display:grid;gap:24px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 20px;padding:0;list-style:none}
.chips li{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:4px 12px;font-size:.9rem}

/* buttons */
.btns{display:flex;flex-wrap:wrap;gap:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 20px;border-radius:12px;font-weight:800;text-decoration:none;border:0;cursor:pointer;font-size:1rem;font-family:inherit}
.btn-call{background:var(--yellow);color:var(--navy)}
.btn-zalo{background:var(--navy);color:#fff}
.hero .btn-zalo,.cta-box .btn-zalo{background:#fff;color:var(--navy)}
.hero .card .btn-zalo{background:var(--navy);color:#fff}
.btn-ghost{background:transparent;color:inherit;border:2px solid currentColor}
.btn-block{width:100%}
.btn svg{width:20px;height:20px;flex:none}

/* cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.hero .card{color:var(--ink)}
.grid{display:grid;gap:16px}
.grid-3,.grid-2{grid-template-columns:1fr}
.feature .ico{width:44px;height:44px;border-radius:12px;background:var(--yellow-2);display:grid;place-items:center;font-size:22px;margin-bottom:10px}
.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;position:relative;padding:16px 16px 16px 64px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.steps li::before{content:counter(s);position:absolute;left:16px;top:16px;width:34px;height:34px;border-radius:50%;background:var(--navy);color:var(--yellow);display:grid;place-items:center;font-weight:900}
.steps b{display:block;color:var(--navy)}

/* calculator */
.calc label{display:block;font-weight:700;font-size:.92rem;margin:0 0 4px}
.calc .row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
input,select,textarea{width:100%;font:inherit;padding:11px 12px;border:1.5px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);min-height:46px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--link);box-shadow:0 0 0 3px rgba(179,18,31,.18)}
.result{background:var(--navy);color:#fff;border-radius:12px;padding:14px 16px;display:flex;justify-content:space-between;align-items:center;gap:10px;margin:6px 0 12px}
.result strong{font-size:1.6rem;color:var(--yellow);font-weight:900}
.stepper{display:flex;align-items:center;gap:8px}
.stepper button{width:46px;height:46px;border-radius:10px;border:1.5px solid var(--line);background:#fff;font-size:1.4rem;font-weight:800;cursor:pointer;color:var(--navy)}
.stepper input{text-align:center;font-weight:800;font-size:1.2rem}

/* table */
.table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.table th,.table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.table th{background:var(--navy);color:#fff;font-weight:700}
.table td:last-child{font-weight:800;color:var(--navy)}
.table tr:last-child td{border-bottom:0}

/* faq */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:10px;padding:0 16px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:10px;color:var(--navy)}
.faq summary::after{content:"+";font-size:1.4rem;line-height:1;color:var(--link)}
.faq details[open] summary::after{content:"–"}
.faq details p{padding-bottom:14px;margin:0}

/* map */
.map{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#dde3ee;aspect-ratio:4/3}
.map iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* article */
.crumbs{font-size:.88rem;color:var(--muted);margin:16px 0 0}
.crumbs a{color:var(--muted)}
.article h2{margin-top:1.6em}
.article ul,.article ol{padding-left:1.2em}
.article li{margin-bottom:.4em}
.tldr{background:var(--yellow-2);border-radius:12px;padding:14px 16px;margin:16px 0 20px}
.tldr b{color:var(--navy)}
.cta-box{background:var(--navy);color:#fff;border-radius:var(--radius);padding:22px;margin:28px 0}
.cta-box h2,.cta-box h3{color:#fff;margin-top:0}
.post-list{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.post-list a{display:block;text-decoration:none;color:inherit}
.post-list a:hover h3{color:var(--link)}
.updated{font-size:.88rem;color:var(--muted)}
.note{border-left:4px solid var(--yellow);background:#fff;padding:10px 14px;border-radius:0 10px 10px 0;margin:16px 0}

/* footer */
footer{background:var(--navy);color:#cfd6e4;padding:32px 0 24px;font-size:.95rem}
footer a{color:#fff}
footer h3{color:#fff;font-size:1rem}
.foot-grid{display:grid;gap:20px}

/* sticky mobile bar */
.dock{position:fixed;left:0;right:0;bottom:0;z-index:30;display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;padding:8px 10px calc(8px + env(safe-area-inset-bottom));background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-top:1px solid var(--line)}
.dock a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:52px;border-radius:12px;text-decoration:none;font-weight:800;font-size:.85rem}
.dock svg{width:22px;height:22px}
.dock .d-call{background:var(--yellow);color:var(--navy)}
.dock .d-zalo{background:var(--navy);color:#fff}
.dock .d-book{background:#fff;color:var(--navy);box-shadow:inset 0 0 0 2px var(--navy)}

.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--navy);color:#fff;padding:10px 16px;border-radius:10px;font-weight:600;opacity:0;pointer-events:none;transition:opacity .2s;z-index:40;max-width:90vw;text-align:center}
.toast.show{opacity:1}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

@media (min-width:720px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-2{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:2fr 1fr 1fr}
  .steps{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:960px){
  body{padding-bottom:0}
  .dock{display:none}
  .nav{display:flex}
  .hero{padding:56px 0 64px}
  .hero-grid{grid-template-columns:1.2fr 1fr;align-items:center}
  section{padding:56px 0}
}
.hero-grid>*,.grid>*,.calc .row>div{min-width:0}
input[type=datetime-local]{min-width:0;max-width:100%;font-size:.95rem}
@media (max-width:420px){.calc .row{grid-template-columns:1fr}}
@media (max-width:480px){.table{font-size:.9rem}.table th,.table td{padding:10px 8px}}
.article .table{display:block;overflow-x:auto}
@media (max-width:400px){.brand small{display:none}.brand{font-size:.95rem}}
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.gallery figure{margin:0;position:relative;border-radius:14px;overflow:hidden;background:var(--line)}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:18px 10px 8px;font-size:.82rem;font-weight:700;color:#fff;background:linear-gradient(transparent,rgba(124,10,19,.88))}
.gallery figure:first-child{grid-column:1/-1}
@media (min-width:720px){.gallery{grid-template-columns:2fr 1fr 1fr}.gallery figure:first-child{grid-column:auto;grid-row:span 2}.gallery figure:first-child img{height:100%}}
.map:empty::after{content:"Bấm nút Chỉ đường bên dưới để mở Google Maps";position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:16px;color:var(--muted);font-weight:600}
.gallery figure:last-child{grid-column:1/-1}
.gallery figure:last-child img{aspect-ratio:16/9}
@media (min-width:720px){.gallery figure:last-child{grid-column:span 2}.gallery figure:last-child img{aspect-ratio:auto;height:100%;max-height:260px}}
.top{top:env(safe-area-inset-top,0px)}
.logo{border-radius:50%;flex:none;box-shadow:0 0 0 2px var(--yellow);background:var(--navy-2)}
.brand .logo{width:40px;height:40px}