:root{
  --paper:#F6F7F4; --ink:#10231F; --ink-2:#3C4F4A; --pine:#0E5C4A; --pine-deep:#083D31;
  --amber:#E8A020; --line:#D9DED8; --card:#FFFFFF;
  --font-display:'Sora',sans-serif; --font-body:'Be Vietnam Pro',sans-serif; --font-mono:'IBM Plex Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--font-display);line-height:1.15;letter-spacing:-.01em}
.eyebrow{font-family:var(--font-mono);font-size:.78rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--pine);display:inline-flex;align-items:center;gap:.6em}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--pine)}
section{padding:88px 0}
.btn{display:inline-block;font-family:var(--font-display);font-weight:700;font-size:.95rem;padding:14px 28px;border-radius:8px;text-decoration:none;transition:transform .15s ease, box-shadow .15s ease;border:2px solid transparent}
.btn:hover{transform:translateY(-2px)}
.btn:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.btn-primary{background:var(--pine);color:#fff;box-shadow:0 6px 18px rgba(14,92,74,.28)}
.btn-primary:hover{background:var(--pine-deep)}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}

/* NAV */
nav{position:sticky;top:0;z-index:50;background:rgba(246,247,244,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{font-family:var(--font-display);font-weight:800;font-size:1.25rem;text-decoration:none}
.logo span{color:var(--pine)}
.nav-links{display:flex;gap:28px;align-items:center;list-style:none}
.nav-links a{text-decoration:none;font-weight:500;font-size:.92rem;color:var(--ink-2)}
.nav-links a:hover{color:var(--pine)}
.nav-cta{background:var(--pine);color:#fff !important;padding:9px 18px;border-radius:7px;font-weight:600}
.nav-cta:hover{background:var(--pine-deep);color:#fff !important}

/* HERO */
.hero{padding:96px 0 80px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:800}
.hero h1 em{font-style:normal;color:var(--pine);position:relative}
.hero p.lead{margin:22px 0 32px;font-size:1.12rem;color:var(--ink-2);max-width:34em}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap}
.hero-meta{margin-top:36px;display:flex;gap:32px;flex-wrap:wrap}
.hero-meta .m{font-family:var(--font-mono)}
.hero-meta .m b{display:block;font-size:1.35rem;color:var(--pine);font-weight:600}
.hero-meta .m span{font-size:.8rem;color:var(--ink-2)}
/* stamp signature */
.stamp{width:168px;height:168px;border:2.5px dashed var(--amber);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;transform:rotate(-8deg);color:var(--amber);font-family:var(--font-display);position:relative;background:rgba(232,160,32,.06)}
.stamp b{font-size:2.6rem;font-weight:800;line-height:1}
.stamp small{font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin-top:4px}
.hero-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:34px;box-shadow:0 20px 50px rgba(16,35,31,.08);display:flex;flex-direction:column;align-items:center;gap:22px}
.hero-card .row{width:100%;display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:.85rem;border-bottom:1px dashed var(--line);padding:9px 0}
.hero-card .row:last-of-type{border-bottom:none}
.hero-card .row b{color:var(--pine)}

/* SERVICES OVERVIEW */
.svc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:44px}
.svc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:30px;position:relative;transition:box-shadow .2s ease,transform .2s ease}
.svc:hover{box-shadow:0 16px 40px rgba(16,35,31,.10);transform:translateY(-3px)}
.svc .code{font-family:var(--font-mono);font-size:.75rem;color:var(--ink-2);letter-spacing:.1em}
.svc h3{margin:10px 0 12px;font-size:1.3rem}
.svc p{color:var(--ink-2);font-size:.95rem}
.svc ul{margin:14px 0 0;list-style:none}
.svc ul li{padding:6px 0 6px 26px;position:relative;font-size:.93rem}
.svc ul li::before{content:"—";position:absolute;left:0;color:var(--pine);font-weight:700}
.svc.special{background:var(--pine-deep);color:#EDF3EF;border-color:var(--pine-deep)}
.svc.special .code{color:#9DC3B4}
.svc.special p, .svc.special ul li{color:#C9DAD1}
.svc.special ul li::before{color:var(--amber)}
.tag-nego{display:inline-block;font-family:var(--font-mono);font-size:.72rem;font-weight:600;letter-spacing:.1em;background:var(--amber);color:var(--pine-deep);padding:4px 10px;border-radius:5px;margin-top:16px}

/* PRICING */
#bang-gia{background:#EEF1EC;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.price-group{margin-top:48px}
.price-group h3{font-size:1.15rem;margin-bottom:18px;display:flex;align-items:center;gap:12px}
.price-group h3 .n{font-family:var(--font-mono);font-size:.8rem;color:var(--pine);font-weight:600}
.price-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;display:flex;flex-direction:column;position:relative}
.pc.pop{border:2px solid var(--pine);box-shadow:0 16px 40px rgba(14,92,74,.14)}
.pc .badge{position:absolute;top:-13px;left:24px;background:var(--pine);color:#fff;font-family:var(--font-mono);font-size:.7rem;font-weight:600;letter-spacing:.08em;padding:4px 12px;border-radius:5px}
.pc h4{font-family:var(--font-display);font-size:1.08rem;font-weight:700}
.pc .for{font-size:.84rem;color:var(--ink-2);margin:6px 0 16px;min-height:2.5em}
.pc .price{font-family:var(--font-mono);font-weight:600;font-size:1.5rem;color:var(--pine)}
.pc .price small{font-size:.78rem;color:var(--ink-2);font-weight:500;display:block;margin-top:2px}
.pc ul{list-style:none;margin:18px 0 22px;flex:1}
.pc ul li{font-size:.88rem;padding:6px 0 6px 24px;position:relative;border-bottom:1px dashed var(--line)}
.pc ul li:last-child{border-bottom:none}
.pc ul li::before{content:"✓";position:absolute;left:0;color:var(--pine);font-weight:700}
.pc .btn{text-align:center;font-size:.88rem;padding:12px 18px}
.pc-note{margin-top:22px;font-size:.85rem;color:var(--ink-2)}
.warranty-line{display:flex;align-items:center;gap:14px;margin-top:46px;background:var(--card);border:1.5px dashed var(--amber);border-radius:12px;padding:18px 24px}
.warranty-line .mini-stamp{flex:none;width:58px;height:58px;border:2px dashed var(--amber);border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-weight:800;color:var(--amber);transform:rotate(-8deg);font-size:1rem}
.warranty-line p{font-size:.95rem}

/* DATA LABELING */
#du-lieu{background:var(--pine-deep);color:#EDF3EF}
#du-lieu .eyebrow{color:var(--amber)}
#du-lieu .eyebrow::before{background:var(--amber)}
.dl-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;margin-top:8px}
#du-lieu h2{font-size:clamp(1.7rem,3.4vw,2.4rem);margin:16px 0 18px}
#du-lieu p{color:#C9DAD1}
.dl-list{margin-top:26px;display:grid;gap:14px}
.dl-item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:16px 20px;font-size:.93rem}
.dl-item b{color:#fff;display:block;font-family:var(--font-display);font-size:.98rem;margin-bottom:3px}
.dl-cta-box{background:rgba(232,160,32,.1);border:1.5px dashed var(--amber);border-radius:14px;padding:34px;text-align:center}
.dl-cta-box .big{font-family:var(--font-mono);font-size:1.15rem;color:var(--amber);font-weight:600;margin:14px 0 20px}

/* PROCESS */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:44px}
.step{border-top:3px solid var(--pine);padding-top:18px}
.step .sn{font-family:var(--font-mono);font-size:.78rem;color:var(--pine);font-weight:600;letter-spacing:.1em}
.step h4{font-family:var(--font-display);font-size:1.02rem;margin:8px 0 8px}
.step p{font-size:.88rem;color:var(--ink-2)}

/* FAQ */
#faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;margin-top:14px;overflow:hidden}
#faq summary{cursor:pointer;padding:18px 22px;font-weight:600;font-family:var(--font-display);font-size:.98rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
#faq summary::-webkit-details-marker{display:none}
#faq summary::after{content:"+";font-family:var(--font-mono);color:var(--pine);font-size:1.2rem;transition:transform .2s}
#faq details[open] summary::after{transform:rotate(45deg)}
#faq details p{padding:0 22px 18px;color:var(--ink-2);font-size:.94rem}

/* CONTACT */
#lien-he{background:#EEF1EC;border-top:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;margin-top:40px;align-items:start}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:34px}
.contact-card .row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px dashed var(--line);font-size:.95rem}
.contact-card .row:last-child{border-bottom:none}
.contact-card .row a{font-family:var(--font-mono);font-weight:600;color:var(--pine);text-decoration:none}
.contact-card .row a:hover{text-decoration:underline}

footer{padding:36px 0;border-top:1px solid var(--line)}
.foot{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--ink-2);flex-wrap:wrap;gap:12px}

/* Biến thể số cột cho .price-cards / .steps dùng ở một số trang con — override đúng ở media query bên dưới để không vỡ layout mobile */
.price-cards.cols-2{grid-template-columns:1fr 1fr}
.steps.cols-3{grid-template-columns:repeat(3,1fr)}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .btn,.svc,.pc{transition:none}
}
/* MOBILE NAV */
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;padding:0;border:none;background:transparent;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.nav-toggle:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media (max-width: 900px){
  .hero-grid,.dl-grid,.contact-grid{grid-template-columns:1fr}
  .price-cards,.price-cards.cols-2{grid-template-columns:1fr}
  .steps,.steps.cols-3{grid-template-columns:repeat(2,1fr)}
  .svc-grid{grid-template-columns:1fr}
  .nav-toggle{display:flex}
  .nav-links{position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--paper);border-bottom:1px solid var(--line);box-shadow:0 16px 30px rgba(16,35,31,.1);max-height:0;overflow:hidden;visibility:hidden;transition:max-height .25s ease}
  .nav-links.is-open{max-height:420px;visibility:visible}
  .nav-links li{width:100%}
  .nav-links li:not(:last-child){display:block}
  .nav-links a{display:block;padding:16px 24px;border-top:1px solid var(--line)}
  .nav-links .nav-cta{margin:16px 24px;text-align:center}
  section{padding:64px 0}
  .hero{padding:64px 0 56px}
}
@media (max-width: 520px){
  .steps,.steps.cols-3{grid-template-columns:1fr}
}

/* Focus-visible dùng chung cho các phần tử tương tác chưa có style riêng (link thường, form, FAQ summary) */
a:focus-visible, summary:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:3px solid var(--amber);
  outline-offset:2px;
}