/* ===== RESET ===== */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --blue:#00adef;--blue-dark:#0090c9;--ink:#0a0a0a;--gray:#6b7280;
  --line:#e5e7eb;--bg:#f4f5f7;--radius:6px;
  --font:'Helvetica Neue',Arial,'Segoe UI',sans-serif;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:#fff;line-height:1.5;font-size:15px}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ===== BUTTONS ===== */
.btn{display:inline-block;padding:11px 26px;border-radius:var(--radius);font-size:13px;font-weight:700;letter-spacing:.5px;text-align:center;cursor:pointer;transition:.2s;border:2px solid transparent}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-outline{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}

/* ===== HEADER ===== */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 6px rgba(0,0,0,.05)}
.header-inner{max-width:1280px;margin:0 auto;display:flex;align-items:center;gap:28px;padding:12px 24px}
.brand-logo{height:38px;width:auto}
.main-nav{flex:1}
.main-nav ul{display:flex;gap:26px}
.main-nav a{font-size:14px;font-weight:600;color:#222;padding:8px 0;position:relative}
.main-nav a:hover{color:var(--blue)}
.main-nav a:hover::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--blue)}
.header-actions{display:flex;align-items:center;gap:16px}
.link-account{font-size:12px;font-weight:700;color:var(--blue);letter-spacing:.5px}
.hamburger{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:6px}
.hamburger span{width:22px;height:2px;background:#222;display:block}

/* ===== HERO ===== */
.hero{position:relative;background:#0a1230;overflow:hidden}
.hero-media img{width:100%;height:auto;object-fit:cover;min-height:280px;max-height:620px}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;color:#fff;padding:20px}
.hero-text h1{font-size:clamp(24px,4vw,52px);font-weight:800;line-height:1.15;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.hero-text h1 .big{color:var(--blue);font-size:1.5em}
.hero-text p{margin-top:12px;font-size:clamp(14px,1.6vw,20px);font-weight:600}
.tier-row{display:flex;gap:2px;margin-top:auto;position:absolute;bottom:40px;left:50%;transform:translateX(-50%);width:min(760px,92%)}
.tier{flex:1;background:linear-gradient(180deg,rgba(60,30,20,.85),rgba(20,10,8,.9));border:1px solid rgba(255,255,255,.12);padding:12px 8px;display:flex;flex-direction:column;gap:4px}
.tier-name{font-size:12px;letter-spacing:1px;color:#d8b98a;font-weight:700}
.tier-pct{font-size:24px;font-weight:800;color:#fff}
.hero-dots{position:absolute;bottom:14px;left:50%;transform:translateX(-50%);display:flex;gap:8px}
.hero-dots .dot{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.5)}
.hero-dots .dot.active{background:#fff}

/* ===== VEHICLE SHOWCASE ===== */
.vehicle-showcase{position:relative;text-align:center;padding:56px 20px 40px;background:#fff;overflow:hidden}
.vehicle-showcase.bike{background:#f4f5f7}
.vs-bg-word{position:absolute;top:30px;left:50%;transform:translateX(-50%);font-size:clamp(48px,12vw,150px);font-weight:800;color:rgba(0,0,0,.05);letter-spacing:4px;white-space:nowrap;pointer-events:none;z-index:0}
.vs-image{position:relative;z-index:1;max-width:640px;margin:0 auto 24px}
.vs-image img{margin:0 auto;max-height:340px;width:auto;object-fit:contain}
.vs-arrow{position:absolute;top:42%;transform:translateY(-50%);z-index:3;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;font-size:22px;color:#555;cursor:pointer;transition:.2s}
.vs-arrow:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.vs-arrow.left{left:24px}.vs-arrow.right{right:24px}
.vs-specs{display:flex;justify-content:center;flex-wrap:wrap;gap:0;max-width:900px;margin:0 auto 26px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.vs-specs .spec{flex:1;min-width:150px;padding:18px 14px;display:flex;flex-direction:column;gap:6px;border-right:1px solid var(--line)}
.vs-specs .spec:last-child{border-right:none}
.vs-specs .label{font-size:12px;color:var(--gray)}
.vs-specs strong{font-size:16px;font-weight:700}
.vs-actions{display:flex;gap:14px;justify-content:center;margin-bottom:14px}
.vs-note{font-size:11px;color:var(--gray);max-width:640px;margin:0 auto}
.vs-thumbs{display:flex;gap:7px;justify-content:center;margin-top:22px}
.vs-thumbs .tdot{width:8px;height:8px;border-radius:50%;background:#cfd4da}
.vs-thumbs .tdot.active{background:var(--blue);width:22px;border-radius:5px}

/* ===== ACCESSORIES ===== */
.accessories{max-width:1080px;margin:0 auto;padding:50px 24px}
.section-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px}
.section-head h2{font-size:24px;font-weight:700}
.see-more{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.5px}
.acc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.acc-card{border:1px solid var(--line);border-radius:8px;padding:18px;text-align:center;transition:.2s;background:#fff}
.acc-card:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);transform:translateY(-4px)}
.acc-img{height:140px;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.acc-img img{max-height:140px;width:auto;object-fit:contain}
.acc-name{font-size:14px;font-weight:600;min-height:38px}
.acc-price{color:var(--blue);font-weight:700;margin-top:6px}

/* ===== CHARGER ===== */
.charger{max-width:1080px;margin:0 auto 20px;padding:0 24px;display:grid;grid-template-columns:1fr 1.4fr;gap:18px}
.charger-left{display:grid;grid-template-rows:1fr 1fr;gap:14px}
.charger-tile{border-radius:8px;min-height:150px;background:linear-gradient(120deg,#dfe6ee,#c5d3e0);display:flex;align-items:flex-end;padding:18px;color:#123;font-weight:700}
.charger-tile.blue{background:linear-gradient(120deg,#0a3d62,#0891cf);color:#fff}
.charger-left>img{display:none}
.charger-right{border-radius:8px;background:#f4f5f7;padding:34px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.charger-copy h3{font-size:22px;font-weight:700}
.charger-copy p{color:var(--gray);max-width:360px}
.charger-img{margin-top:10px}
.charger-img img{max-height:200px;margin:0 auto}

/* ===== SERVICE ===== */
.service{background:linear-gradient(120deg,#e7ebf0,#d3dae2);margin:30px 0;display:grid;grid-template-columns:1fr 1.2fr;align-items:center;gap:20px;padding:40px clamp(24px,6vw,90px)}
.service-copy h3{font-size:26px;font-weight:700;margin-bottom:14px}
.service-copy p{color:#3a4250;max-width:420px;margin-bottom:22px}
.service-actions{display:flex;gap:14px;flex-wrap:wrap}
.service-img img{max-height:280px;margin-left:auto}

/* ===== MLTTVN ===== */
.mlttvn{max-width:1080px;margin:0 auto;padding:30px 24px}
.mlttvn-banner{display:grid;grid-template-columns:1fr 1.3fr;background:#111;border-radius:10px;overflow:hidden;min-height:260px}
.mlttvn-left{background:linear-gradient(135deg,#7a1010,#c62828);display:flex;flex-direction:column;justify-content:center;padding:36px;color:#fff}
.manh-liet{font-size:30px;font-weight:800;line-height:1.1;letter-spacing:1px}
.viet-nam{font-family:'Brush Script MT',cursive;font-size:56px;color:#ffd54f;line-height:1}
.mlttvn-right{background:#1c2530;color:#fff;padding:36px;display:flex;flex-direction:column;justify-content:center;gap:14px}
.mlttvn-right h3{font-size:22px;font-weight:700}
.mlttvn-right p{color:#c7cdd6;font-size:14px}
.mlttvn-right .btn{align-self:flex-start}

/* ===== COMMUNITY ===== */
.community{max-width:1080px;margin:0 auto;padding:10px 24px 40px;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.comm-card{position:relative;border-radius:10px;overflow:hidden;height:220px}
.comm-card img{width:100%;height:100%;object-fit:cover;transition:.4s}
.comm-card:hover img{transform:scale(1.06)}
.comm-label{position:absolute;left:20px;bottom:18px;color:#fff;font-size:18px;font-weight:700;text-shadow:0 2px 8px rgba(0,0,0,.6)}
.comm-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(0,0,0,.5))}

/* ===== NEWSLETTER ===== */
.newsletter{background:linear-gradient(120deg,#11151c,#20262f);color:#fff;padding:56px 24px;text-align:center}
.nl-inner{max-width:640px;margin:0 auto}
.nl-inner h3{font-size:26px;font-weight:700}
.nl-inner>p{color:#b7bdc7;margin:12px 0 24px}
.nl-form{display:flex;gap:12px;max-width:520px;margin:0 auto 16px}
.nl-form input{flex:1;padding:13px 16px;border-radius:6px;border:1px solid #3a4250;background:#fff;font-size:14px}
.nl-note{font-size:11px;color:#8b93a0}

/* ===== FOOTER ===== */
.site-footer{background:#0f1319;color:#aeb4bd;font-size:13px}
.footer-top{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1.2fr;gap:36px;padding:48px 24px}
.footer-logo{height:30px;margin-bottom:16px;filter:brightness(0) invert(1)}
.brand-col p{margin-bottom:8px;line-height:1.6;max-width:440px}
.bct{height:44px;margin-top:14px}
.footer-col h4{color:#fff;font-size:13px;letter-spacing:.6px;margin-bottom:16px}
.footer-col ul li{margin-bottom:11px}
.footer-col a:hover{color:var(--blue)}
.socials{display:flex;gap:10px;margin-top:16px}
.socials a{width:32px;height:32px;border-radius:50%;background:#232a33;display:flex;align-items:center;justify-content:center;color:#fff}
.socials a:hover{background:var(--blue)}
.footer-bottom{border-top:1px solid #232a33;text-align:center;padding:18px;font-size:12px;color:#6b7280}

/* ===== BACK TO TOP ===== */
.back-top{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;border:none;font-size:20px;cursor:pointer;opacity:0;pointer-events:none;transition:.3s;z-index:90;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.back-top.show{opacity:1;pointer-events:auto}

/* ===== RESPONSIVE ===== */
@media(max-width:960px){
  .footer-top{grid-template-columns:1fr 1fr}
  .service{grid-template-columns:1fr;text-align:center}
  .service-img img{margin:0 auto}
  .service-actions{justify-content:center}
  .charger{grid-template-columns:1fr}
  .mlttvn-banner{grid-template-columns:1fr}
  .acc-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:760px){
  .main-nav{position:fixed;top:63px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);display:none;flex:none}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column;gap:0;padding:8px 0}
  .main-nav li{padding:12px 24px;border-bottom:1px solid var(--line)}
  .hamburger{display:flex}
  .link-account,.header-actions .btn{display:none}
  .tier-row{position:static;transform:none;width:100%;margin-top:18px}
  .hero-overlay{position:static;background:#0a1230;padding:30px 20px}
  .hero-media{display:none}
  .tier-pct{font-size:18px}
  .vs-specs .spec{min-width:44%;border-bottom:1px solid var(--line)}
  .community{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .nl-form{flex-direction:column}
  .acc-grid{grid-template-columns:1fr 1fr}
}