/*!
 * F16809 layout stylesheet (basefiles)
 * Prefix: s4fd-
 * Palette: #4682B4 (steel blue) | #4169E1 (royal blue) | #1C2833 (dark slate)
 * Mobile-first, max-width 430px design width.
 * Comments in English; visible copy is Vietnamese.
 */

:root {
  --s4fd-primary: #4682B4;       /* Steel blue */
  --s4fd-accent: #4169E1;        /* Royal blue */
  --s4fd-deep: #1C2833;          /* Dark slate background */
  --s4fd-deeper: #131c25;        /* Even darker for layering */
  --s4fd-gold: #f5b425;          /* Casino gold accent */
  --s4fd-hot: #ff5b6e;           /* Hot pink/red highlight */
  --s4fd-text: #f3f6fb;          /* Primary light text */
  --s4fd-muted: #9fb0c3;         /* Muted secondary text */
  --s4fd-card: #22303d;          /* Card background */
  --s4fd-card-alt: #1b2733;      /* Alt card background */
  --s4fd-border: #324352;        /* Subtle border */
  --s4fd-success: #2ecc71;
  --s4fd-shadow: 0 8px 24px rgba(0, 0, 0, .35);
  --s4fd-radius: 14px;
  --s4fd-radius-sm: 10px;
}

* { box-sizing: border-box; }

html {
  font-size: 62.5%; /* 1rem = 10px base for rem math */
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "Be Vietnam Pro", Roboto, system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #243b55 0%, var(--s4fd-deep) 55%, var(--s4fd-deeper) 100%);
  color: var(--s4fd-text);
  line-height: 1.5rem;
  font-size: 1.5rem;
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

a { color: var(--s4fd-gold); text-decoration: none; }
a:hover { color: #ffd76b; }

.s4fd-container {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 0 1.2rem;
}

.s4fd-wrapper { padding-bottom: 2rem; }

/* ============ Header ============ */
.s4fd-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(28, 40, 51, .96), rgba(19, 28, 37, .96));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--s4fd-border);
  box-shadow: var(--s4fd-shadow);
}

.s4fd-header-inner {
  max-width: 430px;
  margin: 0 auto;
  padding: .55rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
}

.s4fd-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  color: var(--s4fd-text);
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: .3px;
}

.s4fd-brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  box-shadow: 0 0 0 2px rgba(70, 130, 180, .6);
}

.s4fd-brand span { color: var(--s4fd-gold); }

.s4fd-header-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.s4fd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  border: 0;
  border-radius: 999px;
  padding: .65rem 1.1rem;
  font-size: 1.35rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  min-height: 36px;
  font-family: inherit;
}

.s4fd-btn:hover { transform: translateY(-1px); }
.s4fd-btn:active { transform: translateY(0); }

.s4fd-btn-login {
  background: transparent;
  color: var(--s4fd-text);
  border: 1px solid var(--s4fd-border);
}

.s4fd-btn-register {
  background: linear-gradient(135deg, var(--s4fd-gold), #ff8a3c);
  color: #1c1408;
  box-shadow: 0 6px 18px rgba(245, 180, 37, .35);
}

.s4fd-btn-promo {
  background: linear-gradient(135deg, var(--s4fd-accent), var(--s4fd-primary));
  color: #fff;
  box-shadow: 0 6px 18px rgba(65, 105, 225, .35);
}

.s4fd-btn-block {
  width: 100%;
  padding: 1.05rem 1rem;
  font-size: 1.55rem;
}

.s4fd-menu-toggle {
  background: transparent;
  border: 1px solid var(--s4fd-border);
  color: var(--s4fd-text);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.7rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============ Mobile slide-in menu ============ */
.s4fd-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7, 12, 18, .65);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease;
  z-index: 9998;
}
.s4fd-menu-overlay.s4fd-is-visible { opacity: 1; visibility: visible; }

.s4fd-mobile-menu {
  position: fixed;
  top: 0; right: -85%;
  width: 80%;
  max-width: 320px;
  height: 100%;
  background: var(--s4fd-deeper);
  border-left: 1px solid var(--s4fd-border);
  z-index: 9999;
  transition: right .3s ease;
  padding: 2rem 1.4rem;
  overflow-y: auto;
}
.s4fd-mobile-menu.s4fd-is-open { right: 0; }

.s4fd-mobile-menu h3 {
  margin: 0 0 1rem;
  color: var(--s4fd-gold);
  font-size: 1.6rem;
}

.s4fd-mobile-menu a {
  display: block;
  padding: 1rem .6rem;
  border-bottom: 1px solid var(--s4fd-border);
  color: var(--s4fd-text);
  font-weight: 600;
}

.s4fd-mobile-menu a:hover { color: var(--s4fd-gold); padding-left: 1rem; }

.s4fd-no-scroll { overflow: hidden; }

/* ============ Layout spacing for fixed header ============ */
.s4fd-main {
  padding-top: 6.4rem;
}

/* ============ Hero ============ */
.s4fd-hero {
  position: relative;
  padding: 1.6rem 0 1rem;
}

.s4fd-hero h1 {
  font-size: 2.4rem;
  line-height: 1.25;
  margin: 0 0 .8rem;
  color: #fff;
  text-shadow: 0 4px 18px rgba(0, 0, 0, .55);
}

.s4fd-hero p {
  margin: 0 0 1.2rem;
  color: var(--s4fd-muted);
  font-size: 1.45rem;
}

.s4fd-hero-cta { display: flex; gap: .6rem; flex-wrap: wrap; }

/* ============ Carousel ============ */
.s4fd-carousel {
  position: relative;
  border-radius: var(--s4fd-radius);
  overflow: hidden;
  box-shadow: var(--s4fd-shadow);
  margin: 1rem 0;
}

#s4fd-carousel-track { position: relative; }

.s4fd-carousel-slide {
  position: relative;
  display: none;
  cursor: pointer;
}
.s4fd-carousel-slide.s4fd-active { display: block; }

.s4fd-carousel-slide img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.s4fd-carousel-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1.4rem 1.2rem 1.2rem;
  background: linear-gradient(180deg, rgba(7, 12, 18, 0), rgba(7, 12, 18, .92));
  color: #fff;
}

.s4fd-carousel-caption strong {
  display: block;
  font-size: 1.7rem;
  color: var(--s4fd-gold);
  margin-bottom: .25rem;
}

.s4fd-carousel-dots {
  position: absolute;
  bottom: 10px;
  right: 12px;
  display: flex;
  gap: 6px;
}
.s4fd-carousel-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .45);
}
.s4fd-carousel-dot.s4fd-active { background: var(--s4fd-gold); }

.s4fd-carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(7, 12, 18, .55);
  color: #fff;
  border: 0;
  width: 36px; height: 36px;
  border-radius: 50%;
  font-size: 1.6rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
#s4fd-carousel-prev { left: 8px; }
#s4fd-carousel-next { right: 8px; }

/* ============ Section ============ */
.s4fd-section {
  padding: 1.8rem 0 .4rem;
}

.s4fd-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: .6rem;
}

.s4fd-section-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: .55rem;
  margin: 0;
}

.s4fd-section-title i { color: var(--s4fd-gold); }

.s4fd-section-more { color: var(--s4fd-gold); font-size: 1.3rem; font-weight: 600; }

.s4fd-lead {
  color: var(--s4fd-muted);
  font-size: 1.4rem;
  margin: 0 0 1rem;
}

/* ============ Category chips ============ */
.s4fd-chips {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .4rem;
  margin-bottom: .8rem;
  scrollbar-width: none;
}
.s4fd-chips::-webkit-scrollbar { display: none; }

.s4fd-chip {
  flex: 0 0 auto;
  padding: .55rem 1rem;
  border-radius: 999px;
  background: var(--s4fd-card);
  border: 1px solid var(--s4fd-border);
  color: var(--s4fd-text);
  font-size: 1.3rem;
  font-weight: 600;
  cursor: pointer;
}
.s4fd-chip.s4fd-chip-active {
  background: linear-gradient(135deg, var(--s4fd-accent), var(--s4fd-primary));
  border-color: transparent;
  color: #fff;
}

/* ============ Game grid ============ */
.s4fd-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .7rem;
}

.s4fd-game {
  background: var(--s4fd-card);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  text-align: center;
}

.s4fd-game:hover {
  transform: translateY(-2px);
  border-color: var(--s4fd-gold);
  box-shadow: 0 8px 18px rgba(0, 0, 0, .35);
}

.s4fd-game-thumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--s4fd-card-alt);
}

.s4fd-game-name {
  padding: .45rem .35rem .6rem;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--s4fd-text);
  line-height: 1.3;
  min-height: 3.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.s4fd-game-badge {
  position: relative;
}
.s4fd-game-badge::after {
  content: "HOT";
  position: absolute;
  top: 6px; right: 6px;
  background: var(--s4fd-hot);
  color: #fff;
  font-size: 1rem;
  padding: .15rem .45rem;
  border-radius: 6px;
  font-weight: 700;
}

/* ============ Cards / panels ============ */
.s4fd-card {
  background: var(--s4fd-card);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius);
  padding: 1.4rem;
  box-shadow: var(--s4fd-shadow);
}

.s4fd-card h3 {
  margin: 0 0 .8rem;
  font-size: 1.7rem;
  color: #fff;
}

.s4fd-card p {
  margin: 0 0 .8rem;
  color: var(--s4fd-muted);
  font-size: 1.4rem;
}

.s4fd-feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .8rem;
}

.s4fd-feature {
  background: var(--s4fd-card-alt);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  padding: 1.1rem;
  text-align: center;
}
.s4fd-feature i {
  font-size: 2.4rem;
  color: var(--s4fd-gold);
  margin-bottom: .5rem;
}
.s4fd-feature h4 {
  margin: 0 0 .35rem;
  font-size: 1.4rem;
  color: #fff;
}
.s4fd-feature p { margin: 0; font-size: 1.25rem; color: var(--s4fd-muted); }

/* ============ Steps ============ */
.s4fd-steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.s4fd-steps li {
  position: relative;
  padding: 1rem 1rem 1rem 3.4rem;
  background: var(--s4fd-card-alt);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  margin-bottom: .7rem;
  counter-increment: step;
}
.s4fd-steps li::before {
  content: counter(step);
  position: absolute;
  left: .9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2.2rem; height: 2.2rem;
  background: linear-gradient(135deg, var(--s4fd-gold), #ff8a3c);
  color: #1c1408;
  border-radius: 50%;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}
.s4fd-steps strong { color: #fff; display: block; margin-bottom: .2rem; }
.s4fd-steps span { color: var(--s4fd-muted); font-size: 1.3rem; }

/* ============ RTP / data table ============ */
.s4fd-rtp {
  width: 100%;
  border-collapse: collapse;
  background: var(--s4fd-card-alt);
  border-radius: var(--s4fd-radius-sm);
  overflow: hidden;
}
.s4fd-rtp th, .s4fd-rtp td {
  padding: .85rem .7rem;
  text-align: left;
  border-bottom: 1px solid var(--s4fd-border);
  font-size: 1.3rem;
}
.s4fd-rtp th { background: rgba(65, 105, 225, .25); color: #fff; }
.s4fd-rtp td { color: var(--s4fd-muted); }
.s4fd-rtp tr:last-child td { border-bottom: 0; }
.s4fd-rtp .s4fd-pct { color: var(--s4fd-success); font-weight: 700; }

/* ============ Testimonials ============ */
.s4fd-testimonials {
  display: grid;
  gap: .8rem;
}
.s4fd-testimonial {
  background: var(--s4fd-card-alt);
  border-left: 3px solid var(--s4fd-gold);
  border-radius: var(--s4fd-radius-sm);
  padding: 1rem 1.1rem;
}
.s4fd-testimonial p { margin: 0 0 .5rem; font-size: 1.35rem; color: var(--s4fd-text); }
.s4fd-testimonial .s4fd-stars { color: var(--s4fd-gold); font-size: 1.2rem; }
.s4fd-testimonial cite {
  display: block;
  color: var(--s4fd-muted);
  font-size: 1.2rem;
  font-style: normal;
  margin-top: .3rem;
}

/* ============ Payment / winners / promo rows ============ */
.s4fd-row-list { display: grid; gap: .7rem; }
.s4fd-row {
  display: flex;
  align-items: center;
  gap: .9rem;
  background: var(--s4fd-card-alt);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  padding: .85rem 1rem;
}
.s4fd-row i { font-size: 2rem; color: var(--s4fd-gold); }
.s4fd-row strong { color: #fff; font-size: 1.4rem; display: block; }
.s4fd-row span { color: var(--s4fd-muted); font-size: 1.25rem; }

.s4fd-pay-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .5rem;
}
.s4fd-pay {
  background: var(--s4fd-card-alt);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  padding: .7rem .3rem;
  text-align: center;
  font-size: 1.15rem;
  color: var(--s4fd-text);
  font-weight: 600;
}

/* ============ FAQ ============ */
.s4fd-faq { display: grid; gap: .6rem; }
.s4fd-faq-item {
  background: var(--s4fd-card-alt);
  border: 1px solid var(--s4fd-border);
  border-radius: var(--s4fd-radius-sm);
  overflow: hidden;
}
.s4fd-faq-q {
  width: 100%;
  background: transparent;
  border: 0;
  color: #fff;
  text-align: left;
  padding: 1rem 1.1rem;
  font-size: 1.4rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .6rem;
  font-family: inherit;
}
.s4fd-faq-q i { color: var(--s4fd-gold); transition: transform .2s ease; }
.s4fd-faq-item.s4fd-open .s4fd-faq-q i { transform: rotate(45deg); }
.s4fd-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease, padding .25s ease;
  padding: 0 1.1rem;
  color: var(--s4fd-muted);
  font-size: 1.35rem;
}
.s4fd-faq-item.s4fd-open .s4fd-faq-a {
  max-height: 320px;
  padding: 0 1.1rem 1.1rem;
}

/* ============ SEO long text ============ */
.s4fd-prose {
  color: var(--s4fd-muted);
  font-size: 1.4rem;
  line-height: 1.7;
}
.s4fd-prose h2 { color: #fff; font-size: 1.9rem; margin: 1.4rem 0 .6rem; }
.s4fd-prose h3 { color: #fff; font-size: 1.6rem; margin: 1.2rem 0 .5rem; }
.s4fd-prose p { margin: 0 0 .9rem; }
.s4fd-prose ul { padding-left: 1.4rem; margin: 0 0 1rem; }
.s4fd-prose li { margin-bottom: .4rem; }
.s4fd-prose strong { color: var(--s4fd-gold); }

/* ============ CTA banner ============ */
.s4fd-cta {
  background: linear-gradient(135deg, var(--s4fd-accent), var(--s4fd-primary));
  border-radius: var(--s4fd-radius);
  padding: 1.6rem 1.4rem;
  text-align: center;
  box-shadow: var(--s4fd-shadow);
  margin: 1.6rem 0;
}
.s4fd-cta h3 { margin: 0 0 .4rem; color: #fff; font-size: 1.9rem; }
.s4fd-cta p { margin: 0 0 1rem; color: rgba(255, 255, 255, .9); font-size: 1.35rem; }

/* ============ Footer ============ */
.s4fd-footer {
  background: var(--s4fd-deeper);
  border-top: 1px solid var(--s4fd-border);
  padding: 2rem 0 1.5rem;
  margin-top: 1.5rem;
}

.s4fd-footer h4 { color: #fff; font-size: 1.5rem; margin: 0 0 .7rem; }
.s4fd-footer p { color: var(--s4fd-muted); font-size: 1.3rem; margin: 0 0 1rem; }

.s4fd-footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .5rem;
  margin: 0 0 1.2rem;
}
.s4fd-footer-links a {
  color: var(--s4fd-muted);
  font-size: 1.25rem;
  padding: .35rem 0;
}
.s4fd-footer-links a:hover { color: var(--s4fd-gold); }

.s4fd-footer-promos {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0 0 1.2rem;
}
.s4fd-footer-promos .s4fd-btn { font-size: 1.2rem; padding: .55rem .9rem; }

.s4fd-copyright {
  border-top: 1px solid var(--s4fd-border);
  padding-top: 1rem;
  color: var(--s4fd-muted);
  font-size: 1.2rem;
  text-align: center;
}

/* ============ Bottom nav (mobile) ============ */
.s4fd-bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 62px;
  background: linear-gradient(180deg, rgba(28, 40, 51, .98), rgba(19, 28, 37, 1));
  border-top: 1px solid var(--s4fd-border);
  display: flex;
  justify-content: space-around;
  align-items: stretch;
  z-index: 1000;
  box-shadow: 0 -6px 18px rgba(0, 0, 0, .35);
}

.s4fd-bottom-nav-btn {
  flex: 1;
  background: transparent;
  border: 0;
  color: var(--s4fd-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  min-width: 60px;
  min-height: 60px;
  padding: 4px 2px;
  transition: color .15s ease, transform .15s ease;
  font-family: inherit;
  position: relative;
}

.s4fd-bottom-nav-btn i,
.s4fd-bottom-nav-btn .material-icons-outlined,
.s4fd-bottom-nav-btn ion-icon {
  font-size: 22px;
}

.s4fd-bottom-nav-btn ion-icon { font-size: 24px; }

.s4fd-bottom-nav-btn:hover { color: var(--s4fd-gold); transform: translateY(-1px); }
.s4fd-bottom-nav-btn:active { transform: scale(.94); }

.s4fd-bottom-nav-btn.s4fd-active { color: var(--s4fd-gold); }
.s4fd-bottom-nav-btn.s4fd-active::before {
  content: "";
  position: absolute;
  top: 0;
  width: 36px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--s4fd-gold);
}

.s4fd-bottom-nav-btn .s4fd-badge {
  position: absolute;
  top: 6px;
  right: calc(50% - 22px);
  background: var(--s4fd-hot);
  color: #fff;
  font-size: .95rem;
  padding: 0 5px;
  border-radius: 8px;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============ Back to top ============ */
.s4fd-to-top {
  position: fixed;
  right: 14px;
  bottom: 78px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--s4fd-gold);
  color: #1c1408;
  border: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  z-index: 999;
  box-shadow: var(--s4fd-shadow);
}
.s4fd-to-top.s4fd-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ============ Reveal animation ============ */
.s4fd-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s ease, transform .5s ease;
}
.s4fd-reveal.s4fd-revealed { opacity: 1; transform: translateY(0); }

/* ============ Desktop ============ */
@media (min-width: 769px) {
  body { background-size: cover; }
  .s4fd-bottom-nav { display: none; }
  .s4fd-container { max-width: 760px; }
  .s4fd-header-inner { max-width: 760px; }
  .s4fd-grid { grid-template-columns: repeat(5, 1fr); }
  .s4fd-feature-grid { grid-template-columns: repeat(4, 1fr); }
  .s4fd-pay-grid { grid-template-columns: repeat(6, 1fr); }
  .s4fd-footer-links { grid-template-columns: repeat(4, 1fr); }
}

/* Mobile bottom clearance so content is not hidden behind bottom nav */
@media (max-width: 768px) {
  .s4fd-main { padding-bottom: 80px; }
  .s4fd-footer { padding-bottom: 90px; }
}