:root{
  --bg:#f6f7f9;--card:#fff;--ink:#14213d;--muted:#5c6779;--line:#e3e7ee;
  --brand:#1f4e79;--brand-2:#2b6cb0;--accent:#e8590c;--zalo:#0068ff;--ok:#2f9e44;
  --r:14px;--shadow:0 2px 10px rgba(20,33,61,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Be Vietnam Pro",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55;padding-bottom:72px}
a{color:var(--brand-2);text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.muted{color:var(--muted)}.small{font-size:.875rem}

/* header */
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.top-in{display:flex;align-items:center;justify-content:space-between;gap:12px;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);min-width:0}
.brand b{display:block;font-size:1.05rem}
.brand small{display:block;color:var(--muted);font-size:.75rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.logo{width:38px;height:38px;border-radius:10px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700;flex:none}
nav{display:flex;align-items:center;gap:16px}
nav a{color:var(--ink);font-weight:500;font-size:.95rem}
.btn-sm{background:var(--accent);color:#fff!important;padding:8px 14px;border-radius:999px;white-space:nowrap}
@media(max-width:720px){nav{display:none}.brand small{max-width:260px}}

/* hero */
.hero{background:linear-gradient(135deg,var(--brand),#163a5c);color:#fff;padding:44px 0 52px}
.hero h1{margin:0 0 8px;font-size:clamp(1.5rem,4vw,2.3rem);line-height:1.25}
.hero p{margin:0 0 20px;opacity:.9}
.hero-cta{display:flex;flex-wrap:wrap;gap:10px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 18px;border-radius:10px;font-weight:600;border:0;cursor:pointer;font:inherit;font-weight:600}
.btn.call{background:var(--accent);color:#fff}
.btn.zalo{background:var(--zalo);color:#fff}
.btn.ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4)}

/* filters */
.filters{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;background:#fff;padding:14px;border-radius:var(--r);box-shadow:var(--shadow);margin:-26px 0 14px;position:relative}
.filters select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:#fff;color:var(--ink)}
@media(max-width:720px){.filters{grid-template-columns:1fr 1fr}}

/* grid + cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:10px 0 24px}
.card{background:var(--card);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);color:var(--ink);transition:transform .15s,box-shadow .15s}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(20,33,61,.12)}
.ph{position:relative;aspect-ratio:4/3;background:#dde3ea}
.ph img{width:100%;height:100%;object-fit:cover}
.tag{position:absolute;left:10px;top:10px;background:rgba(20,33,61,.82);color:#fff;font-size:.75rem;padding:3px 9px;border-radius:999px}
.tag-in{position:static;display:inline-block;margin-bottom:6px}
.bd{padding:12px 14px 14px}
.bd h3{margin:0 0 6px;font-size:1rem;line-height:1.35}
.meta{display:flex;justify-content:space-between;align-items:center;margin:0 0 4px;font-size:.92rem}
.price{color:var(--accent);font-weight:700}
.loc{margin:0;color:var(--muted);font-size:.88rem}
.phos{margin:6px 0 30px}
.chip{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 12px;margin:4px 4px 0 0;color:var(--ink);font-size:.9rem}

/* detail */
.crumb{font-size:.85rem;color:var(--muted);margin:16px 0}
.dgrid{display:grid;grid-template-columns:1.5fr 1fr;gap:22px;align-items:start}
@media(max-width:860px){.dgrid{grid-template-columns:1fr}}
.gmain{border-radius:var(--r);overflow:hidden;background:#dde3ea;aspect-ratio:4/3}
.gmain img{width:100%;height:100%;object-fit:cover}
.btn.more-photo{display:flex;width:100%;margin-top:10px;background:#fff;color:var(--accent);border:2px solid var(--accent);font-size:16px}
.gthumbs{display:flex;gap:8px;margin-top:8px;overflow-x:auto}
.th{border:2px solid transparent;border-radius:8px;padding:0;width:84px;height:64px;flex:none;overflow:hidden;cursor:pointer;background:none}
.th img{width:100%;height:100%;object-fit:cover}
.th.on{border-color:var(--brand-2)}
.info{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:18px}
.info h1{font-size:1.3rem;margin:0 0 6px;line-height:1.35}
.big-price{color:var(--accent);font-size:1.5rem;font-weight:700;margin:0 0 12px}
.spec{width:100%;border-collapse:collapse;margin-bottom:14px}
.spec th,.spec td{text-align:left;padding:8px 0;border-bottom:1px solid var(--line);font-size:.93rem;vertical-align:top}
.spec th{color:var(--muted);font-weight:500;width:38%}
.actions{display:grid;gap:8px}
.desc{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:18px;margin:20px 0}
.desc h2,section>h2{font-size:1.1rem;margin:4px 0 6px}
.desc p{margin:0 0 12px}
.h1{font-size:clamp(1.4rem,3.5vw,2rem);margin:6px 0 4px}
.lead{color:var(--muted);margin:0 0 8px}

/* lead form */
.lead-box{background:#fff;border-top:1px solid var(--line);padding:34px 0 40px}
.lead-box h2{margin:0 0 4px}
#lead{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px;max-width:760px}
#lead input{padding:12px;border:1px solid var(--line);border-radius:10px;font:inherit}
#lead button{grid-column:1/-1}
@media(max-width:600px){#lead{grid-template-columns:1fr}}
.ok{color:var(--ok);font-weight:600}

/* footer + sticky CTA */
.foot{padding:24px 0;font-size:.92rem;border-top:1px solid var(--line)}
.foot p{margin:4px 0}
.cta-bar{position:fixed;left:0;right:0;bottom:0;display:grid;grid-template-columns:1fr 1fr;z-index:30;box-shadow:0 -2px 12px rgba(0,0,0,.12)}
.cta{color:#fff;text-align:center;padding:14px 8px;font-weight:700}
.cta.call{background:var(--accent)}.cta.zalo{background:var(--zalo)}
@media(min-width:900px){body{padding-bottom:0}.cta-bar{left:auto;right:20px;bottom:20px;grid-template-columns:auto auto;gap:8px;box-shadow:none}.cta{border-radius:999px;padding:12px 18px;box-shadow:0 6px 18px rgba(0,0,0,.18)}}