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/* ===== V3 PREMIUM BRAND UPGRADE ===== */
:root{--red:#e41f35;--red2:#ff4b5f;--silver:#dfe7ef;--deep:#030711}
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.hero{padding-top:168px;background:linear-gradient(90deg,rgba(3,8,17,.98) 0%,rgba(3,8,17,.92) 48%,rgba(3,8,17,.22) 100%),radial-gradient(circle at 85% 38%,rgba(228,31,53,.2),transparent 28%)}
.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:54px 54px;mask-image:linear-gradient(to bottom,black,transparent 90%);pointer-events:none}.hero-grid{grid-template-columns:1.05fr .95fr;gap:70px}.hero-kicker{display:inline-flex;align-items:center;gap:10px;color:#e7eef6;font-size:11px;font-weight:800;letter-spacing:.18em;padding:9px 13px;border:1px solid rgba(255,255,255,.12);border-radius:100px;background:rgba(255,255,255,.04);margin-bottom:22px}.kicker-dot{width:8px;height:8px;border-radius:50%;background:var(--red);box-shadow:0 0 0 6px rgba(228,31,53,.14)}.hero h1{font-size:clamp(50px,5.4vw,82px);line-height:1.01;letter-spacing:-.055em}.hero h1 span{color:#fff}.hero h1 em{background:linear-gradient(90deg,#fff 10%,#9fd9ff 55%,#fff);-webkit-background-clip:text;color:transparent}.hero-lead{font-size:18px;max-width:720px;color:#b8c6d4}.btn-primary{background:linear-gradient(135deg,#e51f36,#b90820);box-shadow:0 16px 38px rgba(221,24,47,.3);border:1px solid rgba(255,255,255,.14)}.btn-primary:hover{box-shadow:0 20px 52px rgba(221,24,47,.42);transform:translateY(-3px)}.btn-shine{position:relative;overflow:hidden}.btn-shine:after{content:"";position:absolute;top:-50%;left:-50%;width:30%;height:200%;background:rgba(255,255,255,.35);transform:rotate(24deg);animation:shine 3.4s infinite}.hero-proof{display:flex;gap:18px;flex-wrap:wrap;margin-top:22px;font-size:12px;color:#9fb0c2}.hero-proof span{display:flex;gap:6px}.trust-row{border-top:1px solid rgba(255,255,255,.08);padding-top:24px}.premium-card{border-color:rgba(255,255,255,.18);box-shadow:0 45px 110px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.035)}.premium-card:after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(145deg,rgba(255,255,255,.11),transparent 23%,transparent 70%,rgba(228,31,53,.13));pointer-events:none}.portrait-card>img{filter:contrast(1.04) saturate(.88)}.logo-watermark{position:absolute;right:22px;top:22px;z-index:3;width:82px;height:82px;border-radius:18px;overflow:hidden;border:1px solid rgba(255,255,255,.2);box-shadow:0 14px 35px rgba(0,0,0,.45)}.logo-watermark img{width:100%;height:100%;object-fit:cover}.portrait-badge{border-color:rgba(255,255,255,.15)}.live-dot{background:var(--red);box-shadow:0 0 0 6px rgba(228,31,53,.14)}.chart-card{border-color:rgba(228,31,53,.25)}.chart-card polyline{stroke:#ff5468}.authority-strip{position:relative;z-index:3;margin-top:-1px;background:#070e18;border-top:1px solid rgba(255,255,255,.07);border-bottom:1px solid rgba(255,255,255,.07)}.authority-strip .container{display:grid;grid-template-columns:repeat(4,1fr)}.authority-strip .container>div{padding:20px 24px;border-right:1px solid rgba(255,255,255,.07)}.authority-strip .container>div:last-child{border:0}.authority-strip b,.authority-strip span{display:block}.authority-strip b{font:700 13px "Space Grotesk";letter-spacing:.08em;color:#fff}.authority-strip span{font-size:11px;color:#8092a7;margin-top:4px}.method-card.featured{border-color:rgba(228,31,53,.36);background:radial-gradient(circle at 80% 15%,rgba(228,31,53,.16),transparent 35%),#0b1a2b}.method-card .num{color:#ff5e71}.program-card.active{border-color:rgba(228,31,53,.45);background:linear-gradient(135deg,rgba(228,31,53,.17),rgba(10,27,45,.88))}.program-card span{color:#ff8492}.experience{background:linear-gradient(135deg,#e41f35,#a8071b)}.youtube-thumb.one{background:linear-gradient(0deg,rgba(1,6,12,.58),rgba(1,6,12,.1)),url('https://img.youtube.com/vi/9_Amv4x7Qzs/maxresdefault.jpg') center/cover}.youtube-thumb.two{background:linear-gradient(0deg,rgba(1,6,12,.58),rgba(1,6,12,.1)),url('https://img.youtube.com/vi/K2NLBEfL6eA/maxresdefault.jpg') center/cover}.youtube-thumb span{width:68px;height:68px;border-radius:50%;background:rgba(228,31,53,.9);inset:50% auto auto 50%;transform:translate(-50%,-50%);display:grid;place-items:center;box-shadow:0 12px 34px rgba(228,31,53,.4)}.video-overlay{position:absolute;left:18px;bottom:16px;font-size:11px;font-weight:800;letter-spacing:.12em;color:#fff}.floating-contact{background:linear-gradient(135deg,#e41f35,#b30b22);box-shadow:0 16px 40px rgba(228,31,53,.35)}
@keyframes shine{0%,55%{left:-50%}100%{left:135%}}
@media(max-width:980px){.site-header{top:34px}.authority-strip .container{grid-template-columns:1fr 1fr}.authority-strip .container>div:nth-child(2){border-right:0}.authority-strip .container>div{border-bottom:1px solid rgba(255,255,255,.07)}}
@media(max-width:640px){.topbar{font-size:8px;letter-spacing:.08em}.topbar a{display:none}.brand-logo{width:44px;height:44px}.site-header{top:34px}.hero{padding-top:132px}.hero h1{font-size:44px}.hero-kicker{font-size:9px}.authority-strip .container>div{padding:15px 12px}.logo-watermark{width:62px;height:62px}}

/* ===== V4 INTERACTION & CONVERSION UPGRADE ===== */
:root{--accent:#48b8ff;--accent2:#7ce8ff;--gold:#f5c86b;--hot:#ff304d}
.scroll-progress{position:fixed;inset:0 auto auto 0;height:3px;width:0;z-index:100;background:linear-gradient(90deg,var(--hot),var(--gold),var(--accent));box-shadow:0 0 18px rgba(72,184,255,.65);transition:width .08s linear}
.section:not(.hero){overflow:hidden}
.section:not(.hero)::before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;filter:blur(110px);opacity:.07;pointer-events:none;background:var(--accent);left:-220px;top:18%}
.section:nth-of-type(even)::before{left:auto;right:-220px;background:var(--hot)}
.section-head h2 em{position:relative;display:inline-block;background:linear-gradient(90deg,#9ad9ff,#fff 50%,#ff9dac);-webkit-background-clip:text;color:transparent;background-size:200% auto;animation:textFlow 6s linear infinite}
.section-head h2 em::after{content:"";position:absolute;left:0;right:0;bottom:-7px;height:2px;background:linear-gradient(90deg,transparent,var(--accent),var(--hot),transparent);transform:scaleX(0);transform-origin:left;transition:transform .9s cubic-bezier(.2,.8,.2,1)}
.section-head.visible h2 em::after{transform:scaleX(1)}
.eyebrow span{box-shadow:0 0 18px rgba(72,184,255,.55)}

/* richer reveal choreography */
.reveal{opacity:0;transform:translateY(42px) scale(.985);filter:blur(7px);transition:opacity .8s cubic-bezier(.2,.75,.2,1),transform .8s cubic-bezier(.2,.75,.2,1),filter .8s ease}
.reveal.visible{opacity:1;transform:none;filter:none}
.method-card.reveal:nth-child(1),.program-card:nth-child(1){transition-delay:.05s}
.method-card.reveal:nth-child(2),.program-card:nth-child(2){transition-delay:.15s}
.method-card.reveal:nth-child(3),.program-card:nth-child(3){transition-delay:.25s}

/* cards feel alive but remain premium */
.method-card,.program-card,.market-grid div,.proof-grid figure,.fit-card,.video-card{transition:transform .45s cubic-bezier(.2,.8,.2,1),border-color .35s ease,box-shadow .45s ease,background .35s ease}
.method-card::before,.fit-card::before{content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;background:linear-gradient(135deg,transparent 10%,rgba(124,232,255,.55),transparent 55%,rgba(255,48,77,.5));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.4s;pointer-events:none}
.method-card:hover,.fit-card:hover{transform:translateY(-10px);border-color:rgba(124,232,255,.35);box-shadow:0 28px 70px rgba(0,0,0,.35),0 0 35px rgba(72,184,255,.1)}
.method-card:hover::before,.fit-card:hover::before{opacity:1}
.method-card:hover .num{transform:translateY(-5px) scale(1.06);text-shadow:0 0 30px rgba(255,48,77,.45)}
.method-card .num{transition:.45s}
.method-card:hover h3{color:#fff}
.method-card.featured{box-shadow:inset 0 0 55px rgba(228,31,53,.045)}
.method-card.featured:hover{box-shadow:0 30px 80px rgba(0,0,0,.42),0 0 45px rgba(228,31,53,.16)}
.mini-chart i{transform-origin:bottom;animation:bars 2.6s ease-in-out infinite alternate}.mini-chart i:nth-child(2){animation-delay:.2s}.mini-chart i:nth-child(3){animation-delay:.4s}.mini-chart i:nth-child(4){animation-delay:.1s}.mini-chart i:nth-child(5){animation-delay:.35s}
.program-card:hover{transform:translateX(-12px) scale(1.015);border-color:rgba(124,232,255,.36);box-shadow:0 20px 50px rgba(0,0,0,.28)}
.program-card.active{position:relative;overflow:hidden;box-shadow:0 20px 60px rgba(228,31,53,.12)}
.program-card.active::after{content:"PHỔ BIẾN";position:absolute;top:13px;right:-31px;width:120px;text-align:center;transform:rotate(35deg);font-size:8px;font-weight:900;letter-spacing:.13em;padding:4px;background:linear-gradient(90deg,#ff3150,#ff7185);color:white}
.market-grid div:hover{transform:translateY(-7px);background:linear-gradient(180deg,rgba(72,184,255,.12),rgba(255,255,255,.025));box-shadow:inset 0 -2px 0 var(--accent)}
.proof-grid figure:hover,.gallery-strip img:hover{transform:translateY(-6px) scale(1.015);border-color:rgba(124,232,255,.4);box-shadow:0 24px 60px rgba(0,0,0,.35)}
.proof-grid figure img,.gallery-strip img{transition:transform .75s cubic-bezier(.2,.8,.2,1),filter .5s ease}
.proof-grid figure:hover img{transform:scale(1.05);filter:saturate(1.1) contrast(1.03)}

/* CTA hierarchy & tasteful pulse */
.btn{position:relative;isolation:isolate}
.btn-primary{background-size:200% 100%;animation:ctaGradient 4s ease infinite}
.btn-primary::before{content:"";position:absolute;inset:-5px;border-radius:17px;background:linear-gradient(135deg,rgba(255,48,77,.65),rgba(72,184,255,.45));filter:blur(13px);opacity:0;z-index:-1;transition:.35s}
.btn-primary:hover::before{opacity:.62}
.hero-actions .btn-primary,.nav-cta,.register-box .btn-primary{animation:ctaGradient 4s ease infinite,ctaPulse 2.8s ease-in-out infinite}
.btn-primary:active{transform:translateY(0) scale(.98)}
.topbar a{display:inline-block;animation:softBlink 2.2s ease-in-out infinite}

/* premium registration block */
.register-box{position:relative;border:1px solid transparent;background:linear-gradient(135deg,#0b1c30,#081522) padding-box,linear-gradient(135deg,var(--hot),rgba(255,255,255,.35),var(--accent),var(--gold)) border-box;box-shadow:0 38px 110px rgba(0,0,0,.38),0 0 60px rgba(72,184,255,.07)}
.register-box::before{content:"";position:absolute;inset:-1px;border-radius:inherit;background:linear-gradient(90deg,transparent,rgba(124,232,255,.18),transparent);background-size:220% 100%;animation:borderSweep 5s linear infinite;pointer-events:none}
.register-copy,.lead-form{position:relative;z-index:1}
.lead-form{border:1px solid rgba(124,232,255,.2);background:linear-gradient(160deg,rgba(8,20,35,.9),rgba(3,10,19,.82));box-shadow:inset 0 1px 0 rgba(255,255,255,.06),0 22px 55px rgba(0,0,0,.3)}
.lead-form::before{content:"ĐĂNG KÝ TƯ VẤN";position:absolute;top:-13px;left:24px;padding:5px 12px;border-radius:100px;background:linear-gradient(135deg,#e51f36,#9e081c);color:#fff;font-size:9px;font-weight:900;letter-spacing:.14em;box-shadow:0 8px 22px rgba(228,31,53,.28)}
.lead-form label{letter-spacing:.02em}
.lead-form input,.lead-form select{transition:border-color .25s,box-shadow .25s,transform .25s,background .25s;border-color:rgba(255,255,255,.13);box-shadow:inset 0 1px 0 rgba(255,255,255,.025)}
.lead-form input:hover,.lead-form select:hover{border-color:rgba(124,232,255,.35)}
.lead-form input:focus,.lead-form select:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(72,184,255,.11),0 0 25px rgba(72,184,255,.1);transform:translateY(-1px);background:#0d2034}
.contact-pills a{transition:.3s;background:rgba(255,255,255,.025)}
.contact-pills a:hover{border-color:rgba(124,232,255,.45);background:rgba(72,184,255,.08);transform:translateY(-2px)}
.floating-contact{animation:floatContact 3s ease-in-out infinite}

/* active navigation */
.nav-links a{position:relative}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:2px;background:linear-gradient(90deg,var(--hot),var(--accent));transition:.3s}
.nav-links a:hover::after,.nav-links a.active::after{right:0}
.nav-links a.active{color:#fff}

@keyframes textFlow{to{background-position:200% center}}
@keyframes bars{to{transform:scaleY(.72);filter:brightness(1.35)}}
@keyframes ctaGradient{0%,100%{background-position:0 50%}50%{background-position:100% 50%}}
@keyframes ctaPulse{0%,100%{box-shadow:0 16px 38px rgba(221,24,47,.3)}50%{box-shadow:0 18px 48px rgba(221,24,47,.48),0 0 0 7px rgba(228,31,53,.07)}}
@keyframes softBlink{0%,100%{opacity:1;transform:translateX(0)}50%{opacity:.72;transform:translateX(3px)}}
@keyframes borderSweep{to{background-position:220% 0}}
@keyframes floatContact{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;scroll-behavior:auto!important;transition-duration:.01ms!important}.reveal{opacity:1;transform:none;filter:none}}
@media(max-width:640px){.program-card.active::after{display:none}.hero-actions .btn-primary,.nav-cta,.register-box .btn-primary{animation:ctaGradient 4s ease infinite}.register-box::before{display:none}.method-card:hover,.fit-card:hover,.proof-grid figure:hover{transform:none}}

/* V5 bilingual + contact polish */
.lang-switch{display:flex;align-items:center;gap:4px;padding:4px;border:1px solid rgba(255,255,255,.12);border-radius:12px;background:rgba(255,255,255,.035);backdrop-filter:blur(12px)}
.lang-btn{min-width:34px;height:30px;border:0;border-radius:8px;background:transparent;color:#8fa4ba;font:800 11px Manrope;cursor:pointer;transition:.22s}
.lang-btn:hover{color:#fff;background:rgba(255,255,255,.06)}
.lang-btn.active{color:#fff;background:linear-gradient(135deg,#2f80ff,#24b8ff);box-shadow:0 6px 18px rgba(47,128,255,.32)}
.contact-pills a:nth-child(2){border-color:rgba(64,201,108,.35);background:rgba(64,201,108,.08)}
.contact-pills a:nth-child(2):hover{border-color:rgba(64,201,108,.7);background:rgba(64,201,108,.14);box-shadow:0 10px 28px rgba(64,201,108,.14)}
html.lang-changing body{opacity:.82;transition:opacity .15s}
@media(max-width:980px){.lang-switch{margin-left:auto}.menu-toggle{margin-left:0}}
@media(max-width:640px){.lang-switch{padding:3px}.lang-btn{min-width:31px;height:28px}.brand-logo{width:40px;height:40px}}