*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --y1:#f5c800;
  --y2:#ffd740;
  --y3:#fff4b0;
  --g1:#1c1c1c;
  --g2:#2e2e2e;
  --g3:#444;
  --g4:#888;
  --g5:#bbb;
  --g6:#e8e8e8;
  --g7:#f4f4f4;
  --white:#ffffff;
}
html{scroll-behavior:smooth}
body{font-family:'Roboto',sans-serif;background:var(--g7);color:var(--g1);overflow-x:hidden}

/* ── SCROLLBAR ── */
::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-track{background:var(--g6)}
::-webkit-scrollbar-thumb{background:var(--y1)}

/* ── NAV ── */
nav{
  position:fixed;top:0;left:0;right:0;z-index:200;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 5vw;height:72px;
  background:rgba(28,28,28,0.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(245,200,0,0.15);
}
.nav-logo{
  font-family:'Roboto',sans-serif;
  font-size:1.8rem;letter-spacing:0.1em;
  color:var(--y1);
}
.nav-links{display:flex;gap:2.5rem;list-style:none}
.nav-links a{
  font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--g5);text-decoration:none;transition:color .2s;
}
.nav-links a:hover{color:var(--y1)}
.nav-cta{
  background:var(--y1);color:var(--g1);
  padding:.55rem 1.5rem;font-size:.72rem;
  font-weight:600;letter-spacing:.15em;text-transform:uppercase;
  border:none;cursor:pointer;transition:background .2s;
  text-decoration:none;
}
.nav-cta:hover{background:var(--y2)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:4px}
.hamburger span{display:block;width:24px;height:2px;background:var(--g5);transition:.3s}

/* ── HERO ── */
.hero{
  min-height:100vh;padding-top:72px;
  display:grid;grid-template-columns:1fr 1fr;
  background:var(--g1);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse 60% 80% at 70% 50%, rgba(245,200,0,.08) 0%, transparent 70%);
  pointer-events:none;
}
.hero-text{
  display:flex;flex-direction:column;justify-content:center;
  padding:6rem 5vw 5rem 8vw;
  position:relative;z-index:2;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:.6rem;
  font-size:.65rem;letter-spacing:.3em;text-transform:uppercase;
  color:var(--y1);margin-bottom:2rem;
  opacity:0;animation:fadeUp .8s .2s forwards;
}
.hero-badge::before{content:'';width:28px;height:1px;background:var(--y1)}
.hero-h1{
  font-family:'Roboto',sans-serif;
  font-size:clamp(4.5rem,9vw,9.5rem);
  line-height:.9;letter-spacing:.02em;
  color:var(--white);
  margin-bottom:2rem;
  opacity:0;animation:fadeUp .9s .35s forwards;
}
.hero-h1 span{color:var(--y1)}
.hero-desc{
  font-size:.9rem;line-height:1.8;color:var(--g5);
  max-width:400px;margin-bottom:2.5rem;
  opacity:0;animation:fadeUp .9s .5s forwards;
}
.hero-actions{
  display:flex;gap:1rem;flex-wrap:wrap;
  opacity:0;animation:fadeUp .9s .65s forwards;
}
.btn-yellow{
  background:var(--y1);color:var(--g1);
  padding:.85rem 2rem;font-size:.78rem;font-weight:600;
  letter-spacing:.15em;text-transform:uppercase;
  border:none;cursor:pointer;text-decoration:none;
  transition:all .25s;display:inline-block;
}
.btn-yellow:hover{background:var(--y2);transform:translateY(-2px)}
.btn-ghost{
  background:transparent;color:var(--g5);
  padding:.85rem 2rem;font-size:.78rem;font-weight:500;
  letter-spacing:.15em;text-transform:uppercase;
  border:1px solid var(--g3);cursor:pointer;text-decoration:none;
  transition:all .25s;display:inline-block;
}
.btn-ghost:hover{border-color:var(--y1);color:var(--y1)}
.hero-stats{
  display:flex;gap:2.5rem;margin-top:3.5rem;
  opacity:0;animation:fadeUp .9s .8s forwards;
  padding-top:2.5rem;border-top:1px solid var(--g2);
}
.stat-item .num{
  font-family:'Roboto',sans-serif;font-size:2.2rem;
  color:var(--y1);letter-spacing:.05em;line-height:1;
}
.stat-item .lbl{font-size:.65rem;letter-spacing:.2em;text-transform:uppercase;color:var(--g4);margin-top:.3rem}

/* Hero visual */
.hero-visual{
  position:relative;display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.hero-visual::before{
  content:'';position:absolute;
  width:500px;height:500px;
  background:radial-gradient(circle, rgba(245,200,0,.18) 0%, transparent 70%);
  border-radius:50%;
}
.hero-ring{
  position:absolute;
  border:1px solid rgba(245,200,0,.12);
  border-radius:50%;
  animation:pulse 3s ease-in-out infinite;
}
.ring1{width:320px;height:320px;animation-delay:0s}
.ring2{width:500px;height:500px;animation-delay:.8s}
.ring3{width:680px;height:680px;animation-delay:1.6s}
.hero-umb{
  position:relative;z-index:2;
  opacity:0;animation:fadeIn 1s .9s forwards, floatMain 5s ease-in-out infinite 1.9s;
  filter:drop-shadow(0 40px 80px rgba(245,200,0,.25));
}

/* ── MARQUEE ── */
.marquee{
  background:var(--y1);padding:.9rem 0;overflow:hidden;
}
.marquee-inner{
  display:flex;white-space:nowrap;
  animation:marquee 18s linear infinite;
  font-size:.68rem;font-weight:700;letter-spacing:.25em;text-transform:uppercase;
  color:var(--g1);gap:0;
}
.marquee-item{
  padding:0 2.5rem;flex-shrink:0;display:inline-flex;align-items:center;gap:1.5rem;
}
.marquee-item::after{content:'◆';font-size:.45rem}

/* ── SECTION COMMON ── */
.section{padding:7rem 8vw}
.section-sm{padding:5rem 8vw}
.sec-eyebrow{
  font-size:.65rem;letter-spacing:.35em;text-transform:uppercase;
  color:var(--y1);margin-bottom:.8rem;
  display:flex;align-items:center;gap:.7rem;
}
.sec-eyebrow::before{content:'';width:24px;height:2px;background:var(--y1)}
.sec-title{
  font-family:'Roboto',sans-serif;
  font-size:clamp(2.5rem,5vw,5rem);
  line-height:.95;letter-spacing:.02em;color:var(--g1);
}
.sec-title-light{color:var(--white)}

/* ── FEATURES STRIP ── */
.features-strip{
  background:var(--g2);
  display:grid;grid-template-columns:repeat(4,1fr);
}
.feat-block{
  padding:3rem 2.5rem;
  border-right:1px solid var(--g3);
  transition:background .3s;position:relative;overflow:hidden;
}
.feat-block:last-child{border-right:none}
.feat-block::after{
  content:'';position:absolute;bottom:0;left:0;
  width:100%;height:3px;background:var(--y1);
  transform:scaleX(0);transform-origin:left;transition:transform .4s;
}
.feat-block:hover::after{transform:scaleX(1)}
.feat-block:hover{background:var(--g1)}
.feat-icon{
  width:48px;height:48px;margin-bottom:1.5rem;
  color:var(--y1);
}
.feat-title{font-size:1rem;font-weight:600;color:var(--white);margin-bottom:.5rem}
.feat-text{font-size:.78rem;line-height:1.7;color:var(--g4)}

/* ── PRODUCT GRID ── */
.products-section{background:var(--g7)}
.products-header{
  display:flex;justify-content:space-between;align-items:flex-end;
  margin-bottom:4rem;flex-wrap:wrap;gap:1.5rem;
}
.filter-tabs{display:flex;gap:.5rem;flex-wrap:wrap}
.tab{
  padding:.45rem 1.2rem;font-size:.7rem;letter-spacing:.15em;text-transform:uppercase;
  font-weight:500;border:1px solid var(--g5);background:transparent;color:var(--g4);
  cursor:pointer;transition:all .2s;
}
.tab.active,.tab:hover{background:var(--y1);border-color:var(--y1);color:var(--g1)}
.product-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1.5px;
  background:var(--g6);
}
.product-card{
  background:var(--white);
  padding:2.5rem 2rem 2rem;
  display:flex;flex-direction:column;
  position:relative;overflow:hidden;
  transition:box-shadow .3s,transform .3s;
  cursor:pointer;
}
.product-card:hover{transform:translateY(-4px);box-shadow:0 20px 60px rgba(0,0,0,.1),0 4px 20px rgba(245,200,0,.15)}
.product-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--y1);transform:scaleX(0);transform-origin:left;
  transition:transform .4s;
}
.product-card:hover::before{transform:scaleX(1)}
.card-tag{
  position:absolute;top:1.2rem;right:1.2rem;
  font-size:.58rem;letter-spacing:.2em;text-transform:uppercase;
  font-weight:700;padding:.3rem .8rem;
}
.tag-new{background:var(--y1);color:var(--g1)}
.tag-best{background:var(--g1);color:var(--y1)}
.tag-sale{background:#e74c3c;color:#fff}
.tag-ltd{background:var(--g3);color:var(--g5)}
.card-num{
  font-size:.6rem;letter-spacing:.25em;color:var(--g5);
  margin-bottom:1.5rem;font-weight:500;
}
.card-svg{
  flex:1;display:flex;align-items:center;justify-content:center;
  padding:1rem 0 1.5rem;min-height:200px;
}
.card-svg img{transition:transform .4s; max-width:100%}
.card-svg svg{transition:transform .4s}
.product-card:hover .card-svg svg, .product-card:hover .card-svg img{transform:scale(1.06) translateY(-6px)}
.card-name{font-family:'Roboto',sans-serif;font-size:1.7rem;letter-spacing:.04em;color:var(--g1);margin-bottom:.2rem}
.card-sub{font-size:.72rem;color:var(--g4);letter-spacing:.1em;margin-bottom:1.2rem}
.card-footer{display:flex;justify-content:space-between;align-items:center;padding-top:1.2rem;border-top:1px solid var(--g6)}
.card-price{font-family:'Roboto',sans-serif;font-size:1.6rem;letter-spacing:.04em;color:var(--g1)}
.card-price small{font-family:'Outfit',sans-serif;font-size:.65rem;color:var(--g4);letter-spacing:.1em;display:block;line-height:1;font-weight:400;margin-bottom:.1rem}
.card-price .old{font-family:'Outfit',sans-serif;font-size:.7rem;color:var(--g5);text-decoration:line-through;font-weight:400;margin-right:.4rem}
.add-btn{
  width:38px;height:38px;border-radius:50%;
  background:var(--g1);color:var(--white);border:none;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;transition:background .2s,transform .2s;flex-shrink:0;
}
.add-btn:hover{background:var(--y1);color:var(--g1);transform:scale(1.1)}
.stars{display:flex;gap:2px;margin-bottom:.8rem}
.star{color:var(--y1);font-size:.75rem}
.star.empty{color:var(--g5)}

/* ── PARALLAX BANNER ── */
.banner{
  background:var(--g1);
  padding:7rem 8vw;
  display:grid;grid-template-columns:1fr 1fr;
  gap:5rem;align-items:center;
  position:relative;overflow:hidden;
}
.banner::before{
  content:'Ô LỆCH TÂM';
  position:absolute;
  font-family:'Roboto',sans-serif;
  font-size:clamp(10rem,22vw,22rem);
  color:rgba(245,200,0,.04);
  letter-spacing:.05em;
  top:50%;left:50%;transform:translate(-50%,-50%);
  pointer-events:none;white-space:nowrap;
}
.banner-text .sec-eyebrow{margin-bottom:1.5rem}
.banner-text .sec-title-light{margin-bottom:1.8rem}
.banner-desc{font-size:.88rem;line-height:1.9;color:var(--g5);margin-bottom:2.5rem;max-width:480px}
.banner-list{list-style:none;display:flex;flex-direction:column;gap:.9rem;margin-bottom:2.5rem}
.banner-list li{
  display:flex;align-items:center;gap:.8rem;
  font-size:.8rem;color:var(--g4);letter-spacing:.05em;
}
.banner-list li::before{
  content:'✓';width:22px;height:22px;border-radius:50%;
  background:rgba(245,200,0,.15);color:var(--y1);
  display:flex;align-items:center;justify-content:center;
  font-size:.65rem;font-weight:700;flex-shrink:0;
}
.banner-visual{display:flex;align-items:center;justify-content:center;position:relative}
.banner-circle{
  width:380px;height:380px;border-radius:50%;
  background:var(--g2);
  display:flex;align-items:center;justify-content:center;
  position:relative;
}
.banner-circle::before{
  content:'';position:absolute;inset:-2px;border-radius:50%;
  background:conic-gradient(var(--y1) 0deg, transparent 120deg, transparent 360deg);
  animation:spin 8s linear infinite;z-index:0;
}
.banner-circle::after{
  content:'';position:absolute;inset:3px;border-radius:50%;
  background:var(--g2);z-index:1;
}
.banner-umb{position:relative;z-index:2}

/* ── TESTIMONIALS ── */
.testimonials{background:var(--white)}
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--g6);margin-top:4rem}
.testi-card{
  background:var(--white);padding:2.5rem 2rem;
  transition:background .3s;
}
.testi-card:hover{background:var(--g7)}
.testi-stars{display:flex;gap:3px;margin-bottom:1.2rem}
.testi-stars span{color:var(--y1);font-size:.8rem}
.testi-text{font-size:.85rem;line-height:1.8;color:var(--g3);margin-bottom:1.8rem;font-style:italic}
.testi-author{display:flex;align-items:center;gap.9rem}
.author-avatar{
  width:42px;height:42px;border-radius:50%;
  background:var(--y1);display:flex;align-items:center;justify-content:center;
  font-family:'Roboto',sans-serif;font-size:1.1rem;color:var(--g1);flex-shrink:0;margin-right:.9rem;
}
.author-name{font-size:.8rem;font-weight:600;color:var(--g1)}
.author-loc{font-size:.68rem;color:var(--g4);margin-top:.1rem}

/* ── CTA ── */
.cta-section{
  background:var(--y1);
  padding:7rem 8vw;
  display:grid;grid-template-columns:1fr auto;
  align-items:center;gap:3rem;
}
.cta-title{
  font-family:'Roboto',sans-serif;
  font-size:clamp(2.5rem,5.5vw,6rem);
  line-height:.95;color:var(--g1);letter-spacing:.02em;
}
.cta-sub{font-size:.9rem;color:var(--g2);margin-top:1rem;max-width:500px;line-height:1.7}
.btn-dark{
  background:var(--g1);color:var(--y1);
  padding:1.1rem 2.8rem;font-size:.78rem;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;
  border:none;cursor:pointer;text-decoration:none;
  transition:all .25s;display:inline-block;white-space:nowrap;
}
.btn-dark:hover{background:var(--g2);transform:translateY(-2px)}

/* ── FOOTER ── */
footer{
  background:var(--g1);padding:4rem 8vw;
  display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:3rem;
  border-top:1px solid var(--g2);
}
.foot-logo{
  font-family:'Roboto',sans-serif;font-size:2rem;
  color:var(--y1);letter-spacing:.1em;margin-bottom:1rem;display:block;
}
.foot-desc{color:var(--g4);line-height:1.8;max-width:240px}
.foot-title{font-size:.65rem;letter-spacing:.3em;text-transform:uppercase;color:var(--y1);margin-bottom:1.5rem;font-weight:600}
.foot-links{list-style:none;display:flex;flex-direction:column;gap:.7rem}
.foot-links a{font-size:.78rem;color:var(--g4);text-decoration:none;transition:color .2s}
.foot-links a:hover{color:var(--y1)}
.foot-bottom{
  background:var(--g1);padding:1.2rem 8vw;
  display:flex;justify-content:space-between;
  border-top:1px solid var(--g2);
  font-size:.65rem;color:var(--g3);letter-spacing:.12em;flex-wrap:wrap;gap:.5rem;
}

/* ── KEYFRAMES ── */
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes floatMain{0%,100%{transform:translateY(0) rotate(-3deg)}50%{transform:translateY(-20px) rotate(-3deg)}}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@keyframes pulse{0%,100%{opacity:.25;transform:scale(1)}50%{opacity:.08;transform:scale(1.04)}}
@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes reveal{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}

.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ── RESPONSIVE ── */
@media(max-width:1024px){
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .features-strip{grid-template-columns:repeat(2,1fr)}
  .feat-block{border-bottom:1px solid var(--g3)}
  footer{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-links,.nav-cta{display:none}
  .hamburger{display:flex}
  .hero{grid-template-columns:1fr}
  .hero-visual{min-height:50vw;padding:3rem}
  .hero-text{padding:5rem 5vw 3rem}
  .product-grid{grid-template-columns:1fr}
  .banner{grid-template-columns:1fr}
  .banner-visual{display:none}
  .testi-grid{grid-template-columns:1fr}
  .cta-section{grid-template-columns:1fr}
  .features-strip{grid-template-columns:1fr}
  footer{grid-template-columns:1fr}
}