/* =========================================================
   c5411 - css/style.css
   Mobile-first HTML5 casino portal (Vietnamese).
   All custom classes use the "s4ba-" prefix.
   Palette: #DB7093 | #A0522D | #C71585 | #212F3D | #FF0000
   Dark colors are backgrounds, light colors are text.
   Code comments are in English.
   ========================================================= */
:root {
  --s4ba-bg: #212F3D; --s4ba-bg-soft: #2c3e50; --s4ba-bg-deep: #18222d;
  --s4ba-primary: #DB7093; --s4ba-secondary: #A0522D; --s4ba-highlight: #C71585;
  --s4ba-cta: #FF0000; --s4ba-text: #fdf6f8; --s4ba-text-soft: #e7c9d4;
  --s4ba-border: rgba(219, 112, 147, 0.25); --s4ba-shadow: 0 0.4rem 1.4rem rgba(0, 0, 0, 0.35);
  --s4ba-maxw: 430px; --s4ba-radius: 1rem; --s4ba-radius-sm: 0.6rem; --s4ba-transition: 0.25s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 62.5%; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: "Be Vietnam Pro", "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background: var(--s4ba-bg);
  background-image: radial-gradient(circle at 20% 0%, rgba(199, 21, 133, 0.18), transparent 45%),
                    radial-gradient(circle at 80% 12%, rgba(160, 82, 45, 0.16), transparent 50%);
  color: var(--s4ba-text); line-height: 1.5rem; font-size: 1.4rem;
  min-height: 100vh; overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--s4ba-primary); text-decoration: none; }
a:hover { color: var(--s4ba-highlight); }

/* Layout containers */
.s4ba-container { width: 100%; max-width: var(--s4ba-maxw); margin: 0 auto; padding: 0 1.2rem; }
.s4ba-wrapper { width: 100%; max-width: var(--s4ba-maxw); margin: 0 auto; }
.s4ba-section { padding: 2.2rem 0; }
.s4ba-section--alt { background: rgba(44, 62, 80, 0.55); }
.s4ba-grid { display: grid; gap: 0.8rem; }
.s4ba-grid--games { grid-template-columns: repeat(3, 1fr); }
.s4ba-grid--cards2 { grid-template-columns: repeat(2, 1fr); }
.s4ba-grid--cards4 { grid-template-columns: repeat(4, 1fr); }
main { display: block; padding-bottom: 80px; }

/* Header */
.s4ba-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: linear-gradient(135deg, var(--s4ba-bg-deep), #1f2c39);
  border-bottom: 0.2rem solid var(--s4ba-highlight); box-shadow: var(--s4ba-shadow);
}
.s4ba-header-inner {
  max-width: var(--s4ba-maxw); margin: 0 auto; padding: 0.6rem 1.2rem;
  display: flex; align-items: center; gap: 0.6rem;
}
.s4ba-brand { display: flex; align-items: center; gap: 0.5rem; flex: 1; min-width: 0; }
.s4ba-brand-logo {
  width: 2.6rem; height: 2.6rem; border-radius: 0.6rem; object-fit: cover;
  border: 0.15rem solid var(--s4ba-primary);
}
.s4ba-brand-name { font-size: 1.6rem; font-weight: 800; color: var(--s4ba-text); letter-spacing: 0.05rem; white-space: nowrap; }
.s4ba-brand-name span { color: var(--s4ba-primary); }
.s4ba-header-actions { display: flex; align-items: center; gap: 0.4rem; }
.s4ba-menu-toggle {
  background: transparent; border: 0.15rem solid var(--s4ba-primary); color: var(--s4ba-primary);
  width: 3.2rem; height: 3.2rem; border-radius: 0.6rem;
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1.6rem;
}
.s4ba-menu-toggle:hover { background: var(--s4ba-primary); color: var(--s4ba-bg-deep); }

/* Buttons */
.s4ba-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  min-height: 3.6rem; padding: 0 1.1rem; border-radius: 2rem; font-size: 1.25rem;
  font-weight: 700; border: 0; cursor: pointer;
  transition: transform var(--s4ba-transition), box-shadow var(--s4ba-transition), filter var(--s4ba-transition);
  text-decoration: none;
}
.s4ba-btn:active { transform: scale(0.96); }
.s4ba-btn--login { background: transparent; color: var(--s4ba-text); border: 0.15rem solid var(--s4ba-primary); }
.s4ba-btn--login:hover { background: var(--s4ba-primary); color: var(--s4ba-bg-deep); }
.s4ba-btn--register { background: linear-gradient(135deg, var(--s4ba-cta), var(--s4ba-highlight)); color: #fff; box-shadow: 0 0.4rem 1rem rgba(255, 0, 0, 0.35); }
.s4ba-btn--register:hover { color: #fff; filter: brightness(1.08); }
.s4ba-btn--cta { background: linear-gradient(135deg, var(--s4ba-primary), var(--s4ba-highlight)); color: #fff; width: 100%; min-height: 4.2rem; font-size: 1.5rem; }
.s4ba-btn--cta:hover { color: #fff; filter: brightness(1.08); }
.s4ba-btn--ghost { background: rgba(219, 112, 147, 0.12); color: var(--s4ba-text); border: 0.1rem solid var(--s4ba-border); }

/* Mobile menu */
.s4ba-mobile-menu {
  position: fixed; top: 0; left: 0; right: 0; z-index: 9999;
  background: var(--s4ba-bg-deep); border-bottom: 0.2rem solid var(--s4ba-highlight);
  transform: translateY(-120%); transition: transform 0.32s ease;
  padding: 5.4rem 1.2rem 1.4rem; max-height: 80vh; overflow-y: auto;
}
.s4ba-mobile-menu--open { transform: translateY(0); }
.s4ba-mobile-menu a { display: block; padding: 1rem 0.4rem; color: var(--s4ba-text); border-bottom: 0.1rem solid rgba(219, 112, 147, 0.12); font-size: 1.35rem; }
.s4ba-mobile-menu a:hover { color: var(--s4ba-primary); padding-left: 0.9rem; }
.s4ba-mobile-menu .s4ba-menu-cta { display: flex; gap: 0.6rem; margin-top: 1rem; }
.s4ba-mobile-menu .s4ba-menu-cta .s4ba-btn { flex: 1; }

/* Carousel */
.s4ba-carousel { position: relative; margin: 5.6rem auto 0; border-radius: var(--s4ba-radius); overflow: hidden; box-shadow: var(--s4ba-shadow); }
.s4ba-carousel-track { position: relative; }
.s4ba-carousel-slide { position: relative; display: none; cursor: pointer; }
.s4ba-carousel-slide--active { display: block; }
.s4ba-carousel-slide img { width: 100%; height: 17rem; object-fit: cover; }
.s4ba-carousel-caption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 0.9rem 1.1rem;
  background: linear-gradient(transparent, rgba(24, 34, 45, 0.92));
  color: var(--s4ba-text); font-size: 1.25rem; font-weight: 600;
}
.s4ba-carousel-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); background: rgba(199, 21, 133, 0.7);
  color: #fff; border: 0; width: 3rem; height: 3rem; border-radius: 50%; font-size: 1.4rem; cursor: pointer; z-index: 2;
}
.s4ba-carousel-arrow:hover { background: var(--s4ba-highlight); }
.s4ba-carousel-prev { left: 0.6rem; }
.s4ba-carousel-next { right: 0.6rem; }
.s4ba-carousel-dots { display: flex; justify-content: center; gap: 0.5rem; padding: 0.7rem 0; }
.s4ba-carousel-dot { width: 0.8rem; height: 0.8rem; border-radius: 50%; background: rgba(253, 246, 248, 0.3); border: 0; cursor: pointer; }
.s4ba-carousel-dot--active { background: var(--s4ba-primary); }

/* Headings */
.s4ba-h1 { font-size: 1.9rem; font-weight: 800; margin: 1.6rem 0 0.8rem; color: var(--s4ba-text); line-height: 1.45; }
.s4ba-h1 span { color: var(--s4ba-primary); }
.s4ba-h2 { font-size: 1.6rem; font-weight: 700; margin: 1.6rem 0 0.8rem; color: var(--s4ba-text); border-left: 0.4rem solid var(--s4ba-highlight); padding-left: 0.7rem; }
.s4ba-h3 { font-size: 1.4rem; font-weight: 700; margin: 1.2rem 0 0.5rem; color: var(--s4ba-primary); }
.s4ba-lead { font-size: 1.35rem; color: var(--s4ba-text-soft); margin-bottom: 1rem; }
.s4ba-p { margin: 0.6rem 0; color: var(--s4ba-text-soft); }

/* Game grid */
.s4ba-category-head { display: flex; align-items: center; gap: 0.6rem; margin: 1.4rem 0 0.8rem; }
.s4ba-category-head i { color: var(--s4ba-primary); font-size: 1.6rem; }
.s4ba-category-head h2 { margin: 0; border: 0; padding: 0; }
.s4ba-game-tile {
  background: var(--s4ba-bg-soft); border: 0.1rem solid var(--s4ba-border);
  border-radius: var(--s4ba-radius-sm); overflow: hidden; cursor: pointer;
  transition: transform var(--s4ba-transition), box-shadow var(--s4ba-transition); text-align: center;
}
.s4ba-game-tile:hover { transform: translateY(-0.3rem); box-shadow: var(--s4ba-shadow); border-color: var(--s4ba-primary); }
.s4ba-game-tile img { width: 100%; height: 8rem; object-fit: cover; border-bottom: 0.1rem solid var(--s4ba-border); }
.s4ba-game-name { display: block; padding: 0.45rem 0.3rem; font-size: 1.05rem; color: var(--s4ba-text); font-weight: 600; line-height: 1.2; min-height: 3rem; }

/* Filter chips */
.s4ba-chips { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.8rem 0; }
.s4ba-chip { background: rgba(219, 112, 147, 0.12); border: 0.1rem solid var(--s4ba-border); color: var(--s4ba-text); padding: 0.4rem 0.9rem; border-radius: 2rem; font-size: 1.1rem; cursor: pointer; }
.s4ba-chip--active, .s4ba-chip:hover { background: var(--s4ba-primary); color: var(--s4ba-bg-deep); }

/* Cards */
.s4ba-card { background: var(--s4ba-bg-soft); border: 0.1rem solid var(--s4ba-border); border-radius: var(--s4ba-radius); padding: 1.1rem; box-shadow: var(--s4ba-shadow); }
.s4ba-card h3 { margin-top: 0; }
.s4ba-feature-row { display: flex; gap: 0.8rem; align-items: flex-start; padding: 0.7rem 0; border-bottom: 0.1rem solid rgba(219, 112, 147, 0.1); }
.s4ba-feature-row:last-child { border-bottom: 0; }
.s4ba-feature-ico { flex: 0 0 3rem; height: 3rem; display: inline-flex; align-items: center; justify-content: center; border-radius: 0.6rem; background: rgba(199, 21, 133, 0.18); color: var(--s4ba-primary); font-size: 1.5rem; }

/* FAQ accordion */
.s4ba-faq-item { background: var(--s4ba-bg-soft); border: 0.1rem solid var(--s4ba-border); border-radius: var(--s4ba-radius-sm); margin-bottom: 0.6rem; overflow: hidden; }
.s4ba-faq-question { padding: 0.9rem 1rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; color: var(--s4ba-text); }
.s4ba-faq-question::after { content: "+"; color: var(--s4ba-primary); font-size: 1.5rem; }
.s4ba-faq-item--open .s4ba-faq-question::after { content: "-"; }
.s4ba-faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.32s ease, padding 0.32s ease; padding: 0 1rem; color: var(--s4ba-text-soft); }
.s4ba-faq-item--open .s4ba-faq-answer { max-height: 40rem; padding: 0 1rem 1rem; }

/* RTP / stat blocks */
.s4ba-stat { background: var(--s4ba-bg-soft); border-radius: var(--s4ba-radius-sm); padding: 0.8rem; text-align: center; border: 0.1rem solid var(--s4ba-border); }
.s4ba-stat-num { display: block; font-size: 1.7rem; font-weight: 800; color: var(--s4ba-primary); }
.s4ba-stat-label { display: block; font-size: 1.1rem; color: var(--s4ba-text-soft); }
.s4ba-bar { height: 0.7rem; border-radius: 1rem; background: rgba(253, 246, 248, 0.15); overflow: hidden; margin-top: 0.4rem; }
.s4ba-bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--s4ba-primary), var(--s4ba-highlight)); }

/* Testimonials */
.s4ba-testimonial { background: var(--s4ba-bg-soft); border-left: 0.35rem solid var(--s4ba-secondary); border-radius: var(--s4ba-radius-sm); padding: 0.9rem 1rem; margin-bottom: 0.7rem; }
.s4ba-testimonial p { color: var(--s4ba-text); font-style: italic; }
.s4ba-testimonial-meta { color: var(--s4ba-primary); font-size: 1.1rem; margin-top: 0.4rem; }

/* Payment & winners */
.s4ba-pill-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.s4ba-pill { background: var(--s4ba-bg-soft); border: 0.1rem solid var(--s4ba-border); border-radius: 0.6rem; padding: 0.7rem 0.3rem; text-align: center; font-size: 1.05rem; color: var(--s4ba-text); }
.s4ba-pill i { display: block; font-size: 1.5rem; color: var(--s4ba-primary); margin-bottom: 0.2rem; }
.s4ba-winner { display: flex; justify-content: space-between; align-items: center; padding: 0.55rem 0.8rem; background: var(--s4ba-bg-soft); border-radius: 0.5rem; margin-bottom: 0.4rem; font-size: 1.15rem; }
.s4ba-winner span:last-child { color: var(--s4ba-cta); font-weight: 700; }

/* Footer */
.s4ba-footer { background: var(--s4ba-bg-deep); border-top: 0.2rem solid var(--s4ba-highlight); padding: 2rem 0 7rem; margin-top: 2rem; }
.s4ba-footer-brand { margin-bottom: 1rem; color: var(--s4ba-text-soft); font-size: 1.2rem; }
.s4ba-footer-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; margin: 0.8rem 0; }
.s4ba-footer-links a { color: var(--s4ba-primary); font-size: 1.15rem; }
.s4ba-footer-links a:hover { color: var(--s4ba-highlight); text-decoration: underline; }
.s4ba-footer-promos { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; margin: 1rem 0; }
.s4ba-footer-copy { margin-top: 1rem; padding-top: 1rem; border-top: 0.1rem solid rgba(219, 112, 147, 0.15); color: var(--s4ba-text-soft); font-size: 1.05rem; text-align: center; }

/* Bottom navigation (mobile only) */
.s4ba-bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000; height: 6rem;
  background: linear-gradient(180deg, #22323f, var(--s4ba-bg-deep));
  border-top: 0.2rem solid var(--s4ba-highlight);
  display: flex; justify-content: space-around; align-items: stretch; padding: 0.4rem 0.2rem;
  box-shadow: 0 -0.3rem 1rem rgba(0, 0, 0, 0.4);
}
.s4ba-bottomnav-btn {
  flex: 1; min-width: 6rem; min-height: 5.2rem; background: transparent; border: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.2rem;
  color: var(--s4ba-text-soft); cursor: pointer; border-radius: 0.6rem;
  transition: color var(--s4ba-transition), transform var(--s4ba-transition), background var(--s4ba-transition);
}
.s4ba-bottomnav-btn i,
.s4ba-bottomnav-btn .material-icons,
.s4ba-bottomnav-btn ion-icon { font-size: 2.2rem; line-height: 1; }
.s4ba-bottomnav-btn span { font-size: 1.05rem; }
.s4ba-bottomnav-btn:hover { color: var(--s4ba-primary); transform: translateY(-0.15rem); }
.s4ba-bottomnav-btn--active { color: var(--s4ba-primary); background: rgba(219, 112, 147, 0.12); }
.s4ba-bottomnav-btn--promo { color: #ffd9e4; }
.s4ba-bottomnav-btn--promo i { color: var(--s4ba-cta); }

/* Utilities */
.s4ba-text-center { text-align: center; }
.s4ba-mt { margin-top: 1.2rem; }
.s4ba-mt-lg { margin-top: 2rem; }
.s4ba-hidden { display: none !important; }
.s4ba-tag { display: inline-block; padding: 0.2rem 0.7rem; background: rgba(199, 21, 133, 0.2); color: var(--s4ba-primary); border-radius: 1rem; font-size: 1rem; margin-right: 0.3rem; }
.s4ba-anchor { display: block; position: relative; top: -5.5rem; visibility: hidden; }

/* Responsive: tablet/desktop */
@media (min-width: 768px) {
  .s4ba-bottomnav { display: none; }
  .s4ba-menu-toggle { display: none; }
  .s4ba-header-inner { max-width: 960px; }
  .s4ba-wrapper, .s4ba-container, .s4ba-carousel, .s4ba-footer .s4ba-container { max-width: 960px; }
  main { padding-bottom: 0; }
  .s4ba-grid--games { grid-template-columns: repeat(6, 1fr); }
  .s4ba-grid--cards2 { grid-template-columns: repeat(4, 1fr); }
  .s4ba-grid--cards4 { grid-template-columns: repeat(8, 1fr); }
  .s4ba-footer-promos { grid-template-columns: repeat(4, 1fr); }
  .s4ba-carousel-slide img { height: 26rem; }
}