:root {
  --primary: #00897B;
  --primary-dark: #00695C;
  --primary-light: #26A69A;
  --primary-gradient: linear-gradient(135deg, #00897B 0%, #26A69A 100%);
  --accent: #FF7043;
  --bg: #FFFFFF;
  --bg-alt: #F0F7F6;
  --text: #1A202C;
  --text-secondary: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 4px 24px rgba(0,137,123,0.10);
  --shadow-lg: 0 12px 48px rgba(0,137,123,0.15);
  --max-w: 1200px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,0.92);backdrop-filter:blur(20px);border-bottom:1px solid rgba(226,232,240,0.6);transition:var(--transition)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;max-width:var(--max-w);margin:0 auto;padding:0 24px}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--text)}
.nav-brand img{width:40px;height:40px;border-radius:10px}
.nav-links{display:flex;align-items:center;gap:32px;list-style:none}
.nav-links a{font-size:14px;font-weight:500;color:var(--text-secondary);transition:var(--transition);position:relative}
.nav-links a:hover{color:var(--primary)}
.nav-cta{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;background:var(--primary);color:#fff !important;border-radius:100px;font-size:14px;font-weight:600;transition:var(--transition);box-shadow:0 4px 16px rgba(0,137,123,0.3)}
.nav-cta:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,137,123,0.4)}
.lang-toggle{display:flex;background:var(--text);border-radius:100px;overflow:hidden;border:1px solid #2D3748}
.lang-btn{padding:6px 14px;font-size:12px;font-weight:600;border:none;background:transparent;cursor:pointer;color:#94A3B8;transition:var(--transition)}
.lang-btn.active{background:#fff;color:var(--text);border-radius:100px}
.nav-hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none}
.nav-hamburger span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}

/* HERO */
.hero{padding:140px 0 80px;background:linear-gradient(180deg,#E0F2F1 0%,#FFFFFF 100%);position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-200px;right:-200px;width:500px;height:500px;background:radial-gradient(circle,rgba(0,137,123,0.08) 0%,transparent 70%);pointer-events:none}
.hero-inner{display:flex;align-items:center;justify-content:space-between;gap:60px}
.hero-content{flex:1;max-width:540px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#E0F2F1;border-radius:100px;font-size:13px;font-weight:600;color:var(--primary);margin-bottom:24px;border:1px solid rgba(0,137,123,0.15)}
.hero-badge span{font-size:16px}
.hero h1{font-size:48px;font-weight:800;line-height:1.15;letter-spacing:-1px;margin-bottom:20px;color:var(--text)}
.hero h1 .highlight{background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{font-size:18px;color:var(--text-secondary);line-height:1.7;margin-bottom:36px}
.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}
.store-btn{display:inline-flex;align-items:center;gap:12px;padding:14px 28px;border-radius:14px;font-weight:600;font-size:15px;transition:var(--transition);border:2px solid var(--border)}
.store-btn.primary{background:var(--text);color:#fff;border-color:var(--text)}
.store-btn.primary:hover{background:#2D3748;transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.store-btn.secondary{background:#fff;color:var(--text)}
.store-btn.secondary:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}
.store-btn svg{width:24px;height:24px}
.store-btn small{font-size:11px;font-weight:400;opacity:0.7;display:block;text-align:left}
.store-btn strong{display:block;font-size:15px}
.hero-image{flex:1;display:flex;justify-content:center;position:relative}
.hero-image img{max-height:580px;width:auto;filter:drop-shadow(0 20px 60px rgba(0,0,0,0.15));animation:float 6s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}
.hero-stats{display:flex;gap:40px;margin-top:40px;padding-top:32px;border-top:1px solid var(--border)}
.hero-stat .number{font-size:28px;font-weight:800;color:var(--primary)}
.hero-stat .label{font-size:13px;color:var(--text-light);margin-top:2px}

/* FEATURES */
.features{padding:100px 0}
.section-header{text-align:center;margin-bottom:64px}
.section-tag{display:inline-flex;align-items:center;gap:6px;padding:6px 16px;background:#E0F2F1;border-radius:100px;font-size:13px;font-weight:600;color:var(--primary);margin-bottom:16px}
.section-header h2{font-size:36px;font-weight:800;letter-spacing:-0.5px;margin-bottom:12px}
.section-header p{font-size:16px;color:var(--text-secondary);max-width:600px;margin:0 auto}
.feature-row{display:flex;align-items:center;gap:80px;margin-bottom:100px}
.feature-row:last-child{margin-bottom:0}
.feature-row.reverse{flex-direction:row-reverse}
.feature-text{flex:1}
.feature-icon-box{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:20px}
.feature-text h3{font-size:28px;font-weight:700;margin-bottom:12px;letter-spacing:-0.3px}
.feature-text p{font-size:16px;color:var(--text-secondary);line-height:1.7;margin-bottom:20px}
.feature-list{list-style:none;display:flex;flex-direction:column;gap:10px}
.feature-list li{display:flex;align-items:center;gap:10px;font-size:15px;color:var(--text-secondary)}
.feature-list li::before{content:'✓';width:24px;height:24px;background:#E0F2F1;color:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}
.feature-image{flex:1;display:flex;justify-content:center}
.feature-image img{max-height:500px;width:auto;border-radius:var(--radius-lg);filter:drop-shadow(0 16px 48px rgba(0,0,0,0.1))}

/* FAQ */
.faq{padding:100px 0;background:var(--bg-alt)}
.faq-list{max-width:720px;margin:0 auto}
.faq-item{background:#fff;border-radius:var(--radius);margin-bottom:12px;border:1px solid var(--border);overflow:hidden;transition:var(--transition)}
.faq-item:hover{box-shadow:var(--shadow)}
.faq-question{width:100%;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;border:none;background:none;cursor:pointer;font-size:16px;font-weight:600;color:var(--text);text-align:left;font-family:inherit}
.faq-question::after{content:'+';font-size:22px;color:var(--primary);font-weight:300;transition:var(--transition);flex-shrink:0;margin-left:16px}
.faq-item.open .faq-question::after{content:'−'}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.4s ease}
.faq-item.open .faq-answer{max-height:300px}
.faq-answer p{padding:0 24px 20px;font-size:15px;color:var(--text-secondary);line-height:1.7}

/* CTA */
.cta{padding:100px 0;text-align:center}
.cta-card{background:var(--primary-gradient);border-radius:32px;padding:72px 48px;position:relative;overflow:hidden;box-shadow:0 20px 60px rgba(0,137,123,0.25)}
.cta-card::before{content:'';position:absolute;top:-100px;right:-100px;width:300px;height:300px;background:rgba(255,255,255,0.08);border-radius:50%}
.cta-card::after{content:'';position:absolute;bottom:-80px;left:-80px;width:250px;height:250px;background:rgba(255,255,255,0.06);border-radius:50%}
.cta-card h2{font-size:36px;font-weight:800;color:#fff;margin-bottom:16px;position:relative;z-index:1;letter-spacing:-0.5px}
.cta-card p{font-size:17px;color:rgba(255,255,255,0.85);margin-bottom:36px;position:relative;z-index:1;max-width:500px;margin-left:auto;margin-right:auto}
.cta-buttons{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;position:relative;z-index:1}
.cta-store-btn{display:inline-flex;align-items:center;gap:12px;padding:14px 28px;background:rgba(255,255,255,0.15);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.25);border-radius:14px;color:#fff;font-weight:600;font-size:15px;transition:var(--transition)}
.cta-store-btn:hover{background:rgba(255,255,255,0.25);transform:translateY(-2px)}
.cta-store-btn svg{width:24px;height:24px}

/* FOOTER */
.footer{padding:60px 0 32px;background:#1A202C;color:#fff}
.footer-inner{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;margin-bottom:48px}
.footer-brand img{width:48px;border-radius:12px;margin-bottom:12px}
.footer-brand p{font-size:14px;color:#94A3B8;line-height:1.7;margin-top:8px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px;text-transform:uppercase;letter-spacing:0.5px;color:#CBD5E1}
.footer-col a{display:block;font-size:14px;color:#94A3B8;padding:4px 0;transition:var(--transition)}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid #2D3748;padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-size:13px;color:#64748B}
.footer-social{display:flex;gap:12px}
.footer-social a{width:36px;height:36px;background:#2D3748;border-radius:10px;display:flex;align-items:center;justify-content:center;transition:var(--transition);font-size:16px}
.footer-social a:hover{background:var(--primary);transform:translateY(-2px)}

/* FLOATING BUTTONS */
.floating-btns{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:12px;z-index:999}
.float-btn{width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:24px;box-shadow:0 4px 16px rgba(0,0,0,0.2);transition:var(--transition);border:none;cursor:pointer}
.float-btn:hover{transform:scale(1.1)}
.float-btn.zalo{background:#0068FF}
.float-btn.whatsapp{background:#25D366}

/* SCROLL ANIMATION */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* RESPONSIVE */
@media(max-width:968px){
  .hero-inner{flex-direction:column;text-align:center}
  .hero-content{max-width:100%}
  .hero h1{font-size:36px}
  .hero-buttons{justify-content:center}
  .hero-stats{justify-content:center}
  .hero-image img{max-height:420px}
  .feature-row,.feature-row.reverse{flex-direction:column;gap:40px;text-align:center}
  .feature-list{align-items:center}
  .feature-image img{max-height:380px}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-links{display:none}
  .nav-hamburger{display:flex}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:#fff;padding:24px;gap:20px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg)}
  .hero{padding:110px 0 60px}
  .hero h1{font-size:30px}
  .hero p{font-size:16px}
  .hero-stats{flex-direction:column;gap:16px;align-items:center}
  .section-header h2{font-size:28px}
  .feature-text h3{font-size:24px}
  .cta-card{padding:48px 24px;border-radius:24px}
  .cta-card h2{font-size:28px}
  .footer-inner{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:16px;text-align:center}
  .floating-btns{bottom:16px;right:16px}
  .float-btn{width:48px;height:48px;font-size:20px}
}

/* LANG TOGGLE */
[data-lang-en]{display:none !important}
body.lang-en [data-lang-vi]{display:none !important}
body.lang-en [data-lang-en]{display:revert !important}