/* ========== VinFast VF2 - Vf2.com.vn ========== */
:root{
  --green:#00A65A; --green-d:#00834a; --blue:#0a2540; --ink:#1a1a1a;
  --muted:#5b6b7a; --line:#e6ebf0; --bg:#ffffff; --bg-alt:#f5f8fa;
  --radius:14px; --shadow:0 8px 30px rgba(10,37,64,.08);
  --max:1160px; --font:'Segoe UI',system-ui,-apple-system,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);line-height:1.6;background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.container--narrow{max-width:760px}

/* ---- Buttons ---- */
.btn{display:inline-block;padding:13px 26px;border-radius:50px;font-weight:700;font-size:15px;
  cursor:pointer;border:2px solid transparent;transition:.2s;text-align:center}
.btn--primary{background:var(--green);color:#fff}
.btn--primary:hover{background:var(--green-d);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.6)}
.btn--ghost:hover{background:rgba(255,255,255,.15)}
.btn--block{display:block;width:100%}
.btn--lg{padding:16px;font-size:17px}

/* ---- Top bar ---- */
.topbar{background:var(--blue);color:#fff;font-size:13.5px}
.topbar__inner{display:flex;justify-content:space-between;align-items:center;padding:8px 20px;flex-wrap:wrap;gap:6px}
.topbar__phone{font-weight:700;color:#7ee6b0}

/* ---- Header ---- */
.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line)}
.header__inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800}
.logo__mark{background:var(--green);color:#fff;padding:6px 10px;border-radius:8px;font-size:18px;letter-spacing:1px}
.logo__text{font-size:17px;line-height:1.1}
.logo__text small{display:block;font-weight:600;font-size:11px;color:var(--muted)}
.nav{display:flex;align-items:center;gap:22px}
.nav a{font-size:14.5px;font-weight:600;color:var(--ink)}
.nav a:hover{color:var(--green)}
.nav__cta{background:var(--green);color:#fff!important;padding:9px 18px;border-radius:50px}
.nav__cta:hover{background:var(--green-d)}
.nav-toggle{display:none;font-size:24px;background:none;border:none;cursor:pointer}

/* ---- Hero ---- */
.hero{background:linear-gradient(135deg,#062b1a 0%,#0a3d24 45%,#0a2540 100%);color:#fff;overflow:hidden}
.hero__inner{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:64px 20px}
.badge{display:inline-block;background:rgba(126,230,176,.15);color:#7ee6b0;padding:6px 14px;border-radius:50px;font-size:13px;font-weight:700;margin-bottom:16px}
.hero h1{font-size:40px;line-height:1.15;margin-bottom:16px}
.hero h1 span{color:#7ee6b0}
.hero__sub{font-size:17px;color:#cfe0d8;margin-bottom:24px;max-width:520px}
.hero__stats{list-style:none;display:flex;gap:26px;margin-bottom:28px;flex-wrap:wrap}
.hero__stats strong{display:block;font-size:28px;color:#fff}
.hero__stats strong small{font-size:15px}
.hero__stats span{font-size:12.5px;color:#9fb5aa}
.hero__actions{display:flex;gap:14px;flex-wrap:wrap}
.hero__media{position:relative;text-align:center}
.hero__img{width:100%;max-width:520px;height:auto;margin:0 auto;border-radius:20px;
  background:rgba(255,255,255,.06);box-shadow:0 20px 50px rgba(0,0,0,.35)}

/* ---- USP strip ---- */
.usp{background:var(--bg-alt);padding:36px 0}
.usp__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.usp__item{text-align:center}
.usp__item span{font-size:32px}
.usp__item h3{font-size:16px;margin:8px 0 4px}
.usp__item p{font-size:13.5px;color:var(--muted)}

/* ---- Sections ---- */
.section{padding:64px 0}
.section--alt{background:var(--bg-alt)}
.section--dark{background:var(--blue);color:#fff}
.section__head{text-align:center;max-width:680px;margin:0 auto 40px}
.section__head h2{font-size:30px;margin-bottom:10px}
.section__head p{color:var(--muted);font-size:16px}
.section__head--light h2,.section__head--light p{color:#fff}
.section__head--light p{color:#cfe0d8}
.section__note{text-align:center;font-size:12.5px;color:var(--muted);margin-top:22px}
.section__note code{background:var(--bg-alt);padding:2px 6px;border-radius:4px;border:1px solid var(--line)}

/* ---- Specs ---- */
.specs{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.specs__group{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.specs__group h3{font-size:16px;color:var(--green);margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--bg-alt)}
.specs table{width:100%;border-collapse:collapse}
.specs th,.specs td{text-align:left;padding:8px 0;font-size:14px;vertical-align:top;border-bottom:1px solid var(--line)}
.specs th{color:var(--muted);font-weight:600;width:52%}
.specs td{font-weight:700}

/* ---- Gallery ---- */
.gallery{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.gallery--3{grid-template-columns:repeat(3,1fr)}
.gallery__item{text-align:center}
.swatch{width:100%;height:210px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:10px;border:1px solid var(--line);transition:.2s}
.swatch:hover{transform:translateY(-4px)}
.gallery figcaption{font-weight:700}
.gallery figcaption{font-size:13.5px;font-weight:600}

/* ---- Features ---- */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.2s}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.feature span{font-size:30px}
.feature h3{font-size:17px;margin:10px 0 6px}
.feature p{font-size:14px;color:var(--muted)}

/* ---- Compare ---- */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:820px;margin:0 auto}
.compare__col{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:26px}
.compare__col--win{background:rgba(0,166,90,.18);border-color:var(--green)}
.compare__col h3{font-size:19px;margin-bottom:10px}
.compare__num{font-size:26px;font-weight:800;margin-bottom:16px}
.compare__num span{display:block;font-size:13px;font-weight:500;color:#cfe0d8}
.compare__col ul{list-style:none}
.compare__col li{padding:6px 0;font-size:14.5px;border-bottom:1px solid rgba(255,255,255,.1)}

/* ---- Pricing ---- */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:34px}
.price-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;text-align:center;box-shadow:var(--shadow)}
.price-card--featured{border:2px solid var(--green);transform:scale(1.03)}
.price-card__tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--green);color:#fff;font-size:12px;font-weight:700;padding:4px 14px;border-radius:50px}
.price-card h3{font-size:18px;margin-bottom:8px}
.price-card__price{font-size:30px;font-weight:800;color:var(--green);margin-bottom:16px}
.price-card__price small{font-size:15px;color:var(--muted)}
.price-card ul{list-style:none;margin-bottom:20px;text-align:left}
.price-card li{padding:7px 0;font-size:14px;border-bottom:1px solid var(--line);color:var(--muted)}
.price-card li:before{content:"✓ ";color:var(--green);font-weight:800}
.promo{background:linear-gradient(135deg,#fff9e6,#fff);border:1px dashed var(--green);border-radius:var(--radius);padding:26px;max-width:640px;margin:0 auto}
.promo h3{font-size:18px;margin-bottom:12px;text-align:center}
.promo ul{list-style:none}
.promo li{padding:6px 0;font-size:15px}

/* ---- FAQ ---- */
.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:12px;padding:0 18px}
.faq summary{cursor:pointer;font-weight:700;padding:16px 0;list-style:none;position:relative;font-size:15.5px}
.faq summary::after{content:"+";position:absolute;right:0;color:var(--green);font-size:22px}
.faq details[open] summary::after{content:"–"}
.faq p{padding:0 0 16px;color:var(--muted);font-size:14.5px}

/* ---- CTA form ---- */
.section--cta{background:linear-gradient(135deg,#0a3d24,#0a2540)}
.lead-form{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.lead-form__row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.lead-form input,.lead-form select,.lead-form textarea{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;background:var(--bg-alt)}
.lead-form input:focus,.lead-form select:focus,.lead-form textarea:focus{outline:none;border-color:var(--green);background:#fff}
.lead-form textarea{margin-bottom:16px;resize:vertical}
.lead-form__msg{text-align:center;margin-top:12px;font-weight:700;font-size:14px}
.lead-form__msg.ok{color:var(--green)}
.lead-form__msg.err{color:#e02424}
.lead-form__privacy{text-align:center;font-size:12px;color:var(--muted);margin-top:12px}

/* ---- Footer ---- */
.footer{background:#08182a;color:#c3d0dc;padding:48px 0 0;font-size:14px}
.footer__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:34px;padding-bottom:34px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer ul{list-style:none}
.footer li{padding:5px 0}
.footer a:hover{color:#7ee6b0}
.logo--footer{margin-bottom:14px}
.logo--footer .logo__text{color:#fff}
.footer__bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;font-size:12.5px;color:#8397a8}

/* ---- Floating CTA ---- */
.floating-cta{position:fixed;right:16px;bottom:16px;z-index:200;display:flex;flex-direction:column;gap:10px}
.floating-cta__btn{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:700;color:#fff;box-shadow:0 6px 18px rgba(0,0,0,.25);font-size:20px}
.floating-cta__btn--call{background:var(--green);animation:pulse 2s infinite}
.floating-cta__btn--zalo{background:#0068ff;font-size:14px}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(0,166,90,.6)}70%{box-shadow:0 0 0 14px rgba(0,166,90,0)}100%{box-shadow:0 0 0 0 rgba(0,166,90,0)}}

/* ---- Responsive ---- */
@media(max-width:900px){
  .hero__inner{grid-template-columns:1fr;padding:44px 20px}
  .specs,.features,.pricing,.usp__grid{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:repeat(3,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav{position:fixed;top:57px;right:0;width:240px;height:calc(100vh - 57px);background:#fff;flex-direction:column;
    align-items:flex-start;gap:0;padding:16px;transform:translateX(100%);transition:.25s;box-shadow:var(--shadow)}
  .nav.open{transform:translateX(0)}
  .nav a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-toggle{display:block}
  .hero h1{font-size:30px}
  .section__head h2{font-size:24px}
  .specs,.features,.pricing,.compare,.usp__grid,.lead-form__row,.footer__grid{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .price-card--featured{transform:none}
  .topbar__inner{justify-content:center}
}