/* Basic reset & variables */
:root{
  --bg:#0b1720; --bg-2:#0e1d28; --surface:#0f766e;
  --card:#0f2230; --muted:#8aa3b5; --text:#e6f1f6; --accent:#14b8a6;
  --ring: rgba(20,184,166,.45); --border:#153245;
}

*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial;line-height:1.6;color:var(--text);background:linear-gradient(180deg,var(--bg),#0a131a) fixed;}

img{max-width:100%;display:block;border-radius:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5rem}
h1{font-size:clamp(2rem,3vw,3rem)}
h2{font-size:clamp(1.5rem,2.2vw,2.2rem);margin-bottom:.5rem}
h3{font-size:1.1rem}
.lead{font-size:1.1rem;color:#d9eef0;opacity:.95}
.small{font-size:.9rem;color:var(--muted)}
.center{text-align:center}.muted{color:var(--muted)}

.container{width:min(1120px,92%);margin-inline:auto}
.flex{display:flex;gap:1rem}.between{justify-content:space-between}.center{align-items:center}
.grid{display:grid;gap:1.5rem}
.grid.two{grid-template-columns:repeat(2,1fr)}
.grid.three{grid-template-columns:repeat(3,1fr)}
@media (max-width:860px){.grid.two,.grid.three{grid-template-columns:1fr}}

.site-header{position:sticky;top:0;background:rgba(11,23,32,.6);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.05);z-index:50}
.site-header .container{padding:.6rem 0}
.brand{display:flex;gap:.6rem;align-items:center;color:#ecfeff;font-weight:700;font-size:1.05rem}
.logo{border-radius:8px}

.nav{display:flex;gap:1rem;align-items:center}
.nav a{color:#e3f6f6;font-weight:500}
.btn{background:var(--surface);color:#03231f;border:1px solid #0fb2a1;padding:.72rem 1rem;border-radius:12px;font-weight:700;display:inline-block}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn.accent{background:#14b8a6;border-color:#14b8a6;color:#031715;box-shadow:0 10px 25px rgba(20,184,166,.2)}
.btn.btn-sm{padding:.5rem .8rem;border-radius:10px}
.btn.w-100{width:100%}

.hamburger{display:none;flex-direction:column;gap:4px;background:none;border:0}
.hamburger span{display:block;width:24px;height:2px;background:#cfeeed;border-radius:2px}
@media (max-width:860px){
  .nav{position:absolute;inset:60px 0 auto 0;display:none;padding:1rem;background:#0a141c;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav.open{display:flex;flex-direction:column}
  .hamburger{display:flex}
}

.hero{padding:clamp(2rem,6vw,5rem) 0;border-bottom:1px solid rgba(255,255,255,.06);background:
 radial-gradient(600px 300px at 10% -10%, rgba(20,184,166,.12), transparent 70%),
 radial-gradient(500px 220px at 110% 10%, rgba(20,184,166,.08), transparent 70%);}
.badges{display:flex;gap:.6rem;flex-wrap:wrap;padding:0;margin:1rem 0 0;list-style:none}
.badges li{background:rgba(20,184,166,.08);border:1px solid rgba(20,184,166,.25);padding:.3rem .6rem;border-radius:999px;font-size:.85rem;color:#b9f3ec}
.actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.2rem}

.section{padding:clamp(2rem,5vw,4rem) 0}
.section.alt{background:linear-gradient(180deg, rgba(16,30,40,.35), rgba(10,20,28,.35));border-block:1px solid rgba(255,255,255,.05)}

.card{background:rgba(4,16,24,.6);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:1rem}
.media-card{border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.06)}
.cards{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.equipment{margin-top:2rem}
.equipment__intro h3{margin-bottom:.3rem}
.equipment-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.equipment-card img{margin-bottom:.6rem;border-radius:12px;border:1px solid rgba(255,255,255,.06)}
.equipment-card h4{margin:.2rem 0 .4rem;font-size:1rem}
.equipment-card p{margin:0;color:#d5e9f2}

.product h3{margin:.6rem 0}
.timeline{display:flex;gap:.8rem;flex-wrap:wrap;margin:1rem 0}
.timeline .step{background:#09151e;border:1px solid rgba(255,255,255,.06);padding:.6rem .8rem;border-radius:12px}
.timeline .step span{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:var(--accent);color:#03231f;font-weight:800;margin-right:.4rem}

.checklist{padding-left:1.1rem}
.checklist li{margin:.4rem 0}

.form label{display:block;margin:.6rem 0}
input,select,textarea{width:100%;padding:.8rem;border-radius:12px;border:1px solid var(--border);background:#07141c;color:var(--text);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--ring)}

.schedule{padding-left:1.2rem}
.site-footer{padding:1rem 0;border-top:1px solid rgba(255,255,255,.06);background:rgba(6,12,18,.6)}
.site-footer .top{color:#d6f9f7}

/* Floating Zalo contact button */
.zalo-fab{
  position:fixed;
  right:1.5rem;
  bottom:1.5rem;
  display:flex;
  align-items:center;
  gap:.5rem;
  background:#0068ff;
  color:#fff;
  padding:.75rem 1rem;
  border-radius:999px;
  text-decoration:none;
  font-weight:600;
  letter-spacing:.01em;
  box-shadow:0 18px 30px rgba(0,0,0,.35);
  z-index:80;
  transition:transform .2s ease,box-shadow .2s ease;
}
.zalo-fab:hover{
  transform:translateY(-2px);
  box-shadow:0 22px 34px rgba(0,0,0,.45);
  text-decoration:none;
}
.zalo-fab__icon{
  width:32px;
  height:32px;
  border-radius:50%;
  background:#fff;
  color:#0068ff;
  display:grid;
  place-items:center;
  font-weight:700;
  font-size:.9rem;
}
@media (max-width:600px){
  .zalo-fab{
    right:1rem;
    bottom:1rem;
    padding:.6rem .85rem;
    font-size:.9rem;
  }
  .zalo-fab__icon{
    width:28px;
    height:28px;
    font-size:.8rem;
  }
}