/*!
 * F1686 design.css - Mobile-first Vietnamese casino portal (max 430px)
 * All custom classes use the "ui4d-" prefix.
 * Palette: #333333 (dark) | #66CDAA (aqua) | #006400 (deep green). Comments in English.
 */
:root{
  --ui4d-primary:#006400; --ui4d-accent:#66CDAA; --ui4d-accent-soft:#4ea890;
  --ui4d-bg:#333333; --ui4d-bg-deep:#262626; --ui4d-bg-soft:#3f3f3f;
  --ui4d-text:#f5f7f6; --ui4d-text-muted:#b9c2be; --ui4d-gold:#f5c542;
  --ui4d-danger:#e0556b; --ui4d-border:rgba(102,205,170,0.22);
  --ui4d-shadow:0 6px 18px rgba(0,0,0,0.35); --ui4d-radius:14px; --ui4d-radius-sm:10px;
  --ui4d-header-h:58px; --ui4d-bnav-h:64px; --ui4d-max:430px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;padding:0;font-size:62.5%;background:var(--ui4d-bg);color:var(--ui4d-text);
  font-family:"Be Vietnam Pro","Segoe UI",system-ui,-apple-system,Arial,sans-serif;
  line-height:1.5rem;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:var(--ui4d-accent);text-decoration:none}

/* Layout */
.ui4d-wrapper{max-width:var(--ui4d-max);margin:0 auto;background:var(--ui4d-bg);min-height:100vh;position:relative;box-shadow:0 0 40px rgba(0,0,0,0.4)}
.ui4d-container{padding:0 1.2rem;width:100%}
main.ui4d-main{padding-bottom:calc(var(--ui4d-bnav-h) + 1.6rem)}

/* Header */
.ui4d-header{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--ui4d-header-h);
  background:rgba(38,38,38,0.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--ui4d-border);
  display:flex;align-items:center;transition:box-shadow .25s ease,background .25s ease}
.ui4d-header.ui4d-is-scrolled{box-shadow:var(--ui4d-shadow)}
.ui4d-header-inner{width:100%;max-width:var(--ui4d-max);margin:0 auto;padding:0 1.2rem;display:flex;align-items:center;justify-content:space-between;gap:0.8rem}
.ui4d-logo{display:flex;align-items:center;gap:0.6rem;color:var(--ui4d-text);font-weight:800;font-size:1.8rem;letter-spacing:0.5px}
.ui4d-logo img{width:28px;height:28px;border-radius:6px}
.ui4d-logo .ui4d-logo-accent{color:var(--ui4d-accent)}
.ui4d-header-actions{display:flex;align-items:center;gap:0.5rem}

/* Buttons */
.ui4d-btn{display:inline-flex;align-items:center;justify-content:center;gap:0.4rem;border:0;border-radius:var(--ui4d-radius-sm);
  padding:0.8rem 1.2rem;font-size:1.3rem;font-weight:700;cursor:pointer;min-height:40px;text-decoration:none;color:#fff;
  transition:transform .15s ease,background .2s ease,box-shadow .2s ease}
.ui4d-btn:active{transform:scale(0.96)}
.ui4d-btn-login{background:transparent;border:1px solid var(--ui4d-accent);color:var(--ui4d-accent)}
.ui4d-btn-register{background:linear-gradient(135deg,var(--ui4d-accent),var(--ui4d-primary));color:#fff;box-shadow:0 4px 12px rgba(102,205,170,0.35)}
.ui4d-btn-ghost{background:var(--ui4d-bg-soft);color:var(--ui4d-text)}
.ui4d-icon-btn{width:40px;height:40px;background:var(--ui4d-bg-soft);border-radius:10px;display:inline-flex;
  align-items:center;justify-content:center;cursor:pointer;border:1px solid var(--ui4d-border);color:var(--ui4d-accent);font-size:1.8rem}

/* Mobile menu */
.ui4d-menu-backdrop{position:fixed;inset:0;background:rgba(0,0,0,0.55);opacity:0;visibility:hidden;transition:opacity .25s ease;z-index:9998}
.ui4d-menu-backdrop.ui4d-is-visible{opacity:1;visibility:visible}
.ui4d-mobile-menu{position:fixed;top:0;right:-82%;width:78%;max-width:320px;height:100vh;background:var(--ui4d-bg-deep);z-index:9999;
  padding:2rem 1.4rem;transition:right .3s ease;overflow-y:auto;border-left:1px solid var(--ui4d-border)}
.ui4d-mobile-menu.ui4d-is-open{right:0}
.ui4d-menu-title{font-size:1.5rem;color:var(--ui4d-text-muted);margin:1.4rem 0 0.6rem;letter-spacing:1px;text-transform:uppercase}
.ui4d-menu-link{display:flex;align-items:center;gap:0.9rem;padding:1.1rem 0.8rem;border-radius:var(--ui4d-radius-sm);
  color:var(--ui4d-text);font-size:1.5rem;font-weight:600;border-bottom:1px solid rgba(255,255,255,0.04)}
.ui4d-menu-link:hover,.ui4d-menu-link:focus{background:var(--ui4d-bg-soft);color:var(--ui4d-accent)}
.ui4d-menu-link i{width:24px;text-align:center;color:var(--ui4d-accent)}
.ui4d-menu-cta{margin-top:1.6rem;display:flex;flex-direction:column;gap:0.8rem}

/* Hero carousel */
.ui4d-hero{margin-top:var(--ui4d-header-h);position:relative;overflow:hidden}
.ui4d-hero-track{display:flex;transition:transform .5s ease}
.ui4d-hero-slide{min-width:100%;position:relative}
.ui4d-hero-slide img{width:100%;height:200px;object-fit:cover}
.ui4d-hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(38,38,38,0.1) 0%,rgba(38,38,38,0.78) 100%);
  display:flex;flex-direction:column;justify-content:flex-end;padding:1.2rem}
.ui4d-hero-title{font-size:2rem;font-weight:800;margin:0 0 0.4rem;color:#fff;text-shadow:0 2px 6px rgba(0,0,0,0.6)}
.ui4d-hero-sub{font-size:1.3rem;color:var(--ui4d-text-muted);margin:0 0 0.8rem}
.ui4d-hero-dots{position:absolute;bottom:0.8rem;left:0;right:0;display:flex;justify-content:center;gap:0.5rem;z-index:2}
.ui4d-hero-dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,0.4);border:0;padding:0;cursor:pointer}
.ui4d-hero-dot.ui4d-is-active{background:var(--ui4d-accent);width:22px;border-radius:4px}
.ui4d-hero-arrow{position:absolute;top:50%;transform:translateY(-50%);background:rgba(0,0,0,0.45);color:#fff;border:0;
  width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:2}
.ui4d-hero-arrow:hover{background:var(--ui4d-primary)}
#ui4d-hero-prev{left:8px}
#ui4d-hero-next{right:8px}

/* Section */
.ui4d-section{padding:2rem 0 0.4rem}
.ui4d-section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.2rem}
.ui4d-section-title{font-size:1.8rem;font-weight:800;color:#fff;margin:0;display:flex;align-items:center;gap:0.6rem}
.ui4d-section-title i{color:var(--ui4d-accent)}
.ui4d-section-link{font-size:1.25rem;color:var(--ui4d-accent);font-weight:600}

/* Cards */
.ui4d-card{background:var(--ui4d-bg-deep);border:1px solid var(--ui4d-border);border-radius:var(--ui4d-radius);padding:1.4rem;box-shadow:var(--ui4d-shadow)}
.ui4d-card h3{margin:0 0 0.6rem;font-size:1.5rem;color:var(--ui4d-accent)}

/* Game grid (compact) */
.ui4d-game-section{margin-bottom:0.4rem}
.ui4d-game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0.7rem}
.ui4d-game-tile{display:block;background:var(--ui4d-bg-deep);border-radius:var(--ui4d-radius-sm);border:1px solid rgba(255,255,255,0.05);
  overflow:hidden;cursor:pointer;text-align:center;transition:transform .15s ease,border-color .2s ease}
.ui4d-game-tile:active{transform:scale(0.95)}
.ui4d-game-tile:hover{border-color:var(--ui4d-accent)}
.ui4d-game-tile img{width:100%;height:84px;object-fit:cover;background:#1f1f1f}
.ui4d-game-name{font-size:1.15rem;color:var(--ui4d-text);padding:0.5rem 0.4rem;line-height:1.25rem;height:3.6rem;overflow:hidden;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-weight:600}
.ui4d-cat-tag{display:inline-flex;align-items:center;gap:0.4rem;font-size:1.15rem;color:var(--ui4d-text-muted);font-weight:600;letter-spacing:0.5px}

/* Category highlights */
.ui4d-cat-row{display:grid;grid-template-columns:repeat(2,1fr);gap:0.7rem}
.ui4d-cat-card{background:linear-gradient(135deg,var(--ui4d-bg-deep),var(--ui4d-bg-soft));border:1px solid var(--ui4d-border);
  border-radius:var(--ui4d-radius);padding:1.2rem;text-align:center;cursor:pointer;transition:transform .15s ease}
.ui4d-cat-card:active{transform:scale(0.97)}
.ui4d-cat-card i{font-size:2.6rem;color:var(--ui4d-accent)}
.ui4d-cat-card h4{margin:0.5rem 0 0.2rem;font-size:1.4rem;color:#fff}
.ui4d-cat-card p{margin:0;font-size:1.15rem;color:var(--ui4d-text-muted)}

/* Feature list */
.ui4d-feature-grid{display:grid;grid-template-columns:1fr;gap:0.8rem}
.ui4d-feature-item{display:flex;align-items:flex-start;gap:0.9rem;padding:1rem;background:var(--ui4d-bg-deep);
  border-left:3px solid var(--ui4d-accent);border-radius:var(--ui4d-radius-sm)}
.ui4d-feature-item .ui4d-feature-ico{width:38px;height:38px;background:rgba(102,205,170,0.15);border-radius:10px;
  display:flex;align-items:center;justify-content:center;color:var(--ui4d-accent);flex-shrink:0}
.ui4d-feature-item h4{margin:0 0 0.3rem;font-size:1.35rem;color:#fff}
.ui4d-feature-item p{margin:0;font-size:1.2rem;color:var(--ui4d-text-muted)}

/* RTP table */
.ui4d-rtp-row{display:grid;grid-template-columns:2fr 1fr 1fr;align-items:center;padding:0.8rem 0.6rem;
  border-bottom:1px dashed rgba(255,255,255,0.06);font-size:1.2rem}
.ui4d-rtp-row span:first-child{color:#fff;font-weight:600}
.ui4d-rtp-row .ui4d-rtp-bar{height:6px;background:rgba(255,255,255,0.08);border-radius:3px;position:relative;overflow:hidden}
.ui4d-rtp-row .ui4d-rtp-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--ui4d-accent),var(--ui4d-primary))}
.ui4d-rtp-row .ui4d-rtp-value{color:var(--ui4d-accent);font-weight:700;text-align:right}

/* Testimonials */
.ui4d-testi-grid{display:grid;grid-template-columns:1fr;gap:0.8rem}
.ui4d-testi{background:var(--ui4d-bg-deep);border:1px solid var(--ui4d-border);border-radius:var(--ui4d-radius);padding:1.1rem 1.2rem}
.ui4d-testi-stars{color:var(--ui4d-gold);font-size:1.3rem;margin-bottom:0.4rem}
.ui4d-testi p{margin:0 0 0.5rem;font-size:1.25rem;color:var(--ui4d-text)}
.ui4d-testi-author{font-size:1.15rem;color:var(--ui4d-text-muted)}

/* Payment */
.ui4d-pay-row{display:flex;flex-wrap:wrap;gap:0.6rem}
.ui4d-pay-chip{display:inline-flex;align-items:center;gap:0.5rem;background:var(--ui4d-bg-deep);
  border:1px solid var(--ui4d-border);border-radius:999px;padding:0.6rem 1rem;font-size:1.2rem;color:var(--ui4d-text)}
.ui4d-pay-chip i{color:var(--ui4d-accent)}

/* Winners */
.ui4d-winner-list{display:grid;grid-template-columns:1fr;gap:0.5rem}
.ui4d-winner{display:flex;align-items:center;justify-content:space-between;background:var(--ui4d-bg-deep);
  padding:0.7rem 0.9rem;border-radius:var(--ui4d-radius-sm);font-size:1.2rem}
.ui4d-winner .ui4d-winner-name{color:#fff;font-weight:600}
.ui4d-winner .ui4d-winner-amount{color:var(--ui4d-gold);font-weight:700}

/* CTA */
.ui4d-cta{background:linear-gradient(135deg,var(--ui4d-primary),var(--ui4d-accent-soft));border-radius:var(--ui4d-radius);
  padding:1.6rem 1.2rem;text-align:center;margin:1.4rem 0;box-shadow:0 8px 22px rgba(0,100,0,0.35)}
.ui4d-cta h3{margin:0 0 0.4rem;color:#fff;font-size:1.7rem}
.ui4d-cta p{margin:0 0 1rem;color:rgba(255,255,255,0.88);font-size:1.25rem}
.ui4d-cta .ui4d-btn{background:#fff;color:var(--ui4d-primary)}
.ui4d-cta .ui4d-btn:hover{background:#f5f7f6}

/* App download */
.ui4d-app-card{background:var(--ui4d-bg-deep);border:1px solid var(--ui4d-border);border-radius:var(--ui4d-radius);padding:1.4rem;display:flex;align-items:center;gap:1rem}
.ui4d-app-card .ui4d-app-ico{font-size:3.4rem;color:var(--ui4d-accent)}
.ui4d-app-card h4{margin:0 0 0.2rem;font-size:1.5rem;color:#fff}
.ui4d-app-card p{margin:0 0 0.6rem;font-size:1.2rem;color:var(--ui4d-text-muted)}
.ui4d-app-btns{display:flex;gap:0.5rem;flex-wrap:wrap}
.ui4d-app-btns .ui4d-btn{padding:0.7rem 1rem;font-size:1.2rem}

/* FAQ */
.ui4d-faq-item{background:var(--ui4d-bg-deep);border:1px solid var(--ui4d-border);border-radius:var(--ui4d-radius-sm);padding:1rem 1.2rem;margin-bottom:0.6rem}
.ui4d-faq-item h4{margin:0 0 0.4rem;font-size:1.35rem;color:var(--ui4d-accent)}
.ui4d-faq-item p{margin:0;font-size:1.22rem;color:var(--ui4d-text)}

/* Prose / SEO */
.ui4d-prose{font-size:1.28rem;color:var(--ui4d-text-muted);line-height:1.7rem}
.ui4d-prose p{margin:0 0 1rem}
.ui4d-prose strong{color:var(--ui4d-accent)}
.ui4d-prose a{color:var(--ui4d-accent);font-weight:700;border-bottom:1px dashed currentColor}
.ui4d-prose h3{color:#fff;font-size:1.5rem;margin:1.4rem 0 0.6rem}

/* Footer */
.ui4d-footer{background:var(--ui4d-bg-deep);border-top:1px solid var(--ui4d-border);padding:2rem 0 1.4rem;margin-top:2rem}
.ui4d-footer-brand{display:flex;align-items:center;gap:0.6rem;margin-bottom:0.8rem}
.ui4d-footer-brand img{width:26px;height:26px;border-radius:6px}
.ui4d-footer-brand strong{font-size:1.6rem;color:#fff}
.ui4d-footer-desc{font-size:1.2rem;color:var(--ui4d-text-muted);margin-bottom:1rem}
.ui4d-footer-links{display:grid;grid-template-columns:repeat(2,1fr);gap:0.5rem 0.8rem;margin-bottom:1rem}
.ui4d-footer-links a{font-size:1.18rem;color:var(--ui4d-text);padding:0.3rem 0}
.ui4d-footer-links a:hover{color:var(--ui4d-accent)}
.ui4d-footer-promos{display:flex;flex-wrap:wrap;gap:0.5rem;margin:0.6rem 0 1rem}
.ui4d-footer-promos .ui4d-btn{padding:0.7rem 1rem;font-size:1.2rem}
.ui4d-footer-copy{font-size:1.1rem;color:var(--ui4d-text-muted);text-align:center;padding-top:1rem;border-top:1px solid rgba(255,255,255,0.05)}

/* Reveal animation */
.ui4d-reveal{opacity:0;transform:translateY(20px);transition:opacity .5s ease,transform .5s ease}
.ui4d-reveal.ui4d-is-visible{opacity:1;transform:translateY(0)}

/* Bottom nav */
.ui4d-bnav{position:fixed;bottom:0;left:0;right:0;height:var(--ui4d-bnav-h);background:rgba(26,26,26,0.98);
  backdrop-filter:blur(12px);border-top:1px solid var(--ui4d-border);display:flex;justify-content:space-around;align-items:stretch;z-index:1000;
  box-shadow:0 -4px 20px rgba(0,0,0,0.4)}
.ui4d-bnav-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0.2rem;background:transparent;border:0;
  color:var(--ui4d-text-muted);cursor:pointer;min-width:60px;min-height:60px;padding:0.4rem 0.2rem;transition:color .2s ease,transform .15s ease;
  text-decoration:none;position:relative}
.ui4d-bnav-btn:active{transform:scale(0.92)}
.ui4d-bnav-btn .ui4d-bnav-ico{font-size:2.2rem;line-height:1}
.ui4d-bnav-btn .ui4d-bnav-label{font-size:1.05rem;font-weight:600;letter-spacing:0.2px}
.ui4d-bnav-btn.ui4d-is-active{color:var(--ui4d-accent)}
.ui4d-bnav-btn.ui4d-is-active::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:30px;height:3px;background:var(--ui4d-accent);border-radius:0 0 4px 4px}
.ui4d-bnav-promo .ui4d-bnav-ico{background:linear-gradient(135deg,var(--ui4d-accent),var(--ui4d-primary));color:#fff;width:40px;height:40px;
  border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:2rem;box-shadow:0 4px 10px rgba(102,205,170,0.45);margin-bottom:0.2rem}

/* Responsive */
@media (min-width:769px){.ui4d-bnav{display:none} main.ui4d-main{padding-bottom:2rem} .ui4d-wrapper{box-shadow:0 0 60px rgba(0,0,0,0.5)}}
@media (min-width:600px){.ui4d-game-grid{grid-template-columns:repeat(4,1fr)} .ui4d-cat-row{grid-template-columns:repeat(3,1fr)}}