/* ============================================================
 * qq881.click - Shared design stylesheet
 * Prefix: sfa4-   |   Palette: #40E0D0 / #34495E / #20B2AA
 * Mobile-first, root font 62.5% (1rem = 10px).
 * ============================================================ */

:root {
  --sfa4-primary: #40E0D0;
  --sfa4-secondary: #20B2AA;
  --sfa4-deep: #34495E;
  --sfa4-bg: #0d1b24;
  --sfa4-bg-2: #122a38;
  --sfa4-card: #16313f;
  --sfa4-card-2: #1b3a4b;
  --sfa4-text: #eaf6f6;
  --sfa4-muted: #9fb3bd;
  --sfa4-gold: #ffc94d;
  --sfa4-danger: #ff5d73;
  --sfa4-border: rgba(64, 224, 208, 0.18);
  --sfa4-shadow: 0 6px 22px rgba(0, 0, 0, 0.35);
  --sfa4-radius: 14px;
}

* { 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", "Roboto", "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #16435a 0%, var(--sfa4-bg) 60%);
  color: var(--sfa4-text);
  line-height: 1.5rem;
  font-size: 1.4rem;
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--sfa4-primary); text-decoration: none; }
ul { list-style: none; }

/* ---------- Layout helpers ---------- */
.sfa4-container { width: 100%; max-width: 430px; margin: 0 auto; padding: 0 1.4rem; }
.sfa4-wrapper { padding: 2rem 0; }
.sfa4-section { padding: 2.6rem 0; }
.sfa4-grid { display: grid; gap: 1.2rem; }

.sfa4-reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.sfa4-reveal.sfa4-revealed { opacity: 1; transform: none; }

/* ---------- Buttons ---------- */
.sfa4-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .6rem;
  padding: 1rem 1.6rem; border: none; border-radius: 999px;
  font-size: 1.35rem; font-weight: 700; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  min-height: 44px; line-height: 1;
}
.sfa4-btn-primary { background: linear-gradient(135deg, var(--sfa4-primary), var(--sfa4-secondary)); color: #06212a; box-shadow: 0 4px 14px rgba(64, 224, 208, .35); }
.sfa4-btn-gold { background: linear-gradient(135deg, #ffd86b, var(--sfa4-gold)); color: #3a2600; box-shadow: 0 4px 14px rgba(255, 201, 77, .35); }
.sfa4-btn-ghost { background: transparent; color: var(--sfa4-primary); border: 1.5px solid var(--sfa4-primary); }
.sfa4-btn:hover { transform: translateY(-1px); }
.sfa4-btn:active { transform: scale(.97); }

/* ---------- Header ---------- */
.sfa4-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: linear-gradient(180deg, rgba(13, 27, 36, .96), rgba(13, 27, 36, .88));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--sfa4-border);
}
.sfa4-header-row { display: flex; align-items: center; gap: 1rem; padding: .8rem 1.4rem; max-width: 430px; margin: 0 auto; }
.sfa4-brand { display: flex; align-items: center; gap: .8rem; flex: 1; min-width: 0; }
.sfa4-brand img { width: 32px; height: 32px; border-radius: 8px; }
.sfa4-brand-name { font-size: 1.7rem; font-weight: 800; color: var(--sfa4-text); letter-spacing: .5px; }
.sfa4-brand-name span { color: var(--sfa4-primary); }
.sfa4-header-actions { display: flex; align-items: center; gap: .6rem; }
.sfa4-btn-mini { padding: .7rem 1.1rem; font-size: 1.25rem; min-height: 40px; }
.sfa4-menu-btn {
  background: transparent; border: 1px solid var(--sfa4-border); color: var(--sfa4-primary);
  width: 40px; height: 40px; border-radius: 10px; font-size: 1.8rem; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
}

/* Expandable nav menu */
.sfa4-nav { max-height: 0; overflow: hidden; transition: max-height .35s ease; background: var(--sfa4-bg-2); border-top: 1px solid var(--sfa4-border); }
.sfa4-nav-open { max-height: 540px; }
.sfa4-nav-list { max-width: 430px; margin: 0 auto; padding: .6rem 1.4rem 1rem; display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.sfa4-nav-list a {
  display: flex; align-items: center; gap: .6rem; padding: .9rem 1rem;
  background: var(--sfa4-card); color: var(--sfa4-text); border-radius: 10px;
  font-size: 1.25rem; border: 1px solid var(--sfa4-border);
}
.sfa4-nav-list a i { color: var(--sfa4-primary); }

/* ---------- Page body offset for fixed header ---------- */
.sfa4-main { padding-top: 64px; }
@media (max-width: 768px) { .sfa4-main { padding-bottom: 88px; } }

/* ---------- Carousel ---------- */
.sfa4-carousel { position: relative; border-radius: var(--sfa4-radius); overflow: hidden; box-shadow: var(--sfa4-shadow); }
.sfa4-slide { display: none; position: relative; cursor: pointer; }
.sfa4-slide-active { display: block; }
.sfa4-slide img { width: 100%; height: 200px; object-fit: cover; }
.sfa4-slide-caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 1.2rem 1.4rem; background: linear-gradient(0deg, rgba(0,0,0,.82), transparent);
  color: #fff; font-size: 1.3rem; font-weight: 600;
}
.sfa4-slide-caption strong { color: var(--sfa4-primary); display: block; font-size: 1.55rem; }
.sfa4-dots { position: absolute; bottom: 10px; right: 14px; display: flex; gap: .5rem; }
.sfa4-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,.4); cursor: pointer; }
.sfa4-dot-active { background: var(--sfa4-primary); width: 22px; border-radius: 5px; }

/* ---------- Headings ---------- */
.sfa4-h1 {
  font-size: 2.3rem; line-height: 1.25; font-weight: 800; margin: 1.4rem 0;
  background: linear-gradient(135deg, #fff, var(--sfa4-primary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.sfa4-section-title {
  display: flex; align-items: center; gap: .8rem;
  font-size: 1.8rem; font-weight: 800; margin-bottom: 1.4rem; color: var(--sfa4-text);
}
.sfa4-section-title i { color: var(--sfa4-primary); font-size: 2.1rem; }
.sfa4-section-title span { color: var(--sfa4-primary); }
.sfa4-eyebrow { display: inline-block; font-size: 1.1rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--sfa4-secondary); margin-bottom: .4rem; }

/* ---------- Game grid ---------- */
.sfa4-game-block { margin-bottom: 2.4rem; }
.sfa4-game-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem; }
.sfa4-game-card {
  background: var(--sfa4-card); border: 1px solid var(--sfa4-border);
  border-radius: 12px; padding: .7rem; text-align: center; cursor: pointer;
  transition: transform .2s ease, border-color .2s ease; overflow: hidden;
}
.sfa4-game-card:hover { transform: translateY(-3px); border-color: var(--sfa4-primary); }
.sfa4-game-card img { width: 100%; height: 76px; object-fit: cover; border-radius: 8px; margin-bottom: .5rem; }
.sfa4-game-card span { font-size: 1.1rem; color: var(--sfa4-text); font-weight: 600; display: block; line-height: 1.25; min-height: 28px; }
.sfa4-cat-tag {
  display: inline-block; padding: .3rem .9rem; border-radius: 999px;
  background: rgba(64, 224, 208, .12); color: var(--sfa4-primary);
  font-size: 1.1rem; font-weight: 700; margin-bottom: .9rem;
}

/* ---------- Info / feature cards ---------- */
.sfa4-card {
  background: var(--sfa4-card); border: 1px solid var(--sfa4-border);
  border-radius: var(--sfa4-radius); padding: 1.6rem; box-shadow: var(--sfa4-shadow);
}
.sfa4-feature-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.sfa4-feature {
  display: flex; gap: 1.2rem; align-items: flex-start;
  background: var(--sfa4-card-2); padding: 1.2rem; border-radius: 12px; border: 1px solid var(--sfa4-border);
}
.sfa4-feature .sfa4-feature-ic {
  flex: 0 0 44px; width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--sfa4-primary), var(--sfa4-secondary));
  display: flex; align-items: center; justify-content: center; color: #06212a; font-size: 2rem;
}
.sfa4-feature h3 { font-size: 1.4rem; margin-bottom: .3rem; color: #fff; }
.sfa4-feature p { color: var(--sfa4-muted); font-size: 1.2rem; line-height: 1.4; }

/* ---------- Steps ---------- */
.sfa4-steps { counter-reset: step; display: grid; gap: 1rem; }
.sfa4-step { display: flex; gap: 1.2rem; align-items: flex-start; }
.sfa4-step-num {
  flex: 0 0 34px; width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sfa4-gold), #ff9f43); color: #3a2600;
  font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 1.4rem;
}
.sfa4-step h4 { font-size: 1.35rem; color: #fff; margin-bottom: .25rem; }
.sfa4-step p { color: var(--sfa4-muted); font-size: 1.2rem; line-height: 1.45; }

/* ---------- RTP table ---------- */
.sfa4-rtp-table { width: 100%; border-collapse: collapse; font-size: 1.2rem; }
.sfa4-rtp-table th, .sfa4-rtp-table td { padding: .85rem .8rem; text-align: left; border-bottom: 1px solid var(--sfa4-border); }
.sfa4-rtp-table th { color: var(--sfa4-primary); font-size: 1.15rem; }
.sfa4-rtp-table td { color: var(--sfa4-text); }
.sfa4-rtp-badge { padding: .25rem .7rem; border-radius: 999px; background: rgba(255, 201, 77, .15); color: var(--sfa4-gold); font-weight: 700; font-size: 1.1rem; }

/* ---------- Testimonials ---------- */
.sfa4-testimonial { background: var(--sfa4-card-2); padding: 1.3rem; border-radius: 12px; border: 1px solid var(--sfa4-border); margin-bottom: 1rem; }
.sfa4-testimonial-head { display: flex; align-items: center; gap: .9rem; margin-bottom: .7rem; }
.sfa4-avatar { width: 38px; height: 38px; border-radius: 50%; background: linear-gradient(135deg, var(--sfa4-primary), var(--sfa4-deep)); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; }
.sfa4-testimonial-head strong { display: block; font-size: 1.3rem; color: #fff; }
.sfa4-stars { color: var(--sfa4-gold); font-size: 1.1rem; }
.sfa4-testimonial p { color: var(--sfa4-muted); font-size: 1.2rem; line-height: 1.5; }

/* ---------- Payment & app CTA ---------- */
.sfa4-pay-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .7rem; }
.sfa4-pay {
  background: var(--sfa4-card-2); border: 1px solid var(--sfa4-border);
  border-radius: 10px; padding: .9rem .4rem; text-align: center; font-size: 1rem; color: var(--sfa4-text);
}
.sfa4-pay i { font-size: 2rem; color: var(--sfa4-primary); display: block; margin-bottom: .3rem; }
.sfa4-app-cta {
  background: linear-gradient(135deg, var(--sfa4-deep), #1d4a5e);
  border: 1px solid var(--sfa4-primary); border-radius: var(--sfa4-radius);
  padding: 1.8rem; text-align: center; box-shadow: var(--sfa4-shadow);
}
.sfa4-app-cta h3 { font-size: 1.7rem; color: #fff; margin-bottom: .6rem; }
.sfa4-app-cta p { color: var(--sfa4-muted); font-size: 1.25rem; margin-bottom: 1.2rem; }
.sfa4-app-buttons { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }

/* ---------- Winners ticker ---------- */
.sfa4-winner-strip { background: var(--sfa4-card-2); border: 1px solid var(--sfa4-border); border-radius: 12px; padding: 1rem 1.2rem; }
.sfa4-winner-item { display: none; align-items: center; gap: .9rem; font-size: 1.2rem; }
.sfa4-winner-active { display: flex; }
.sfa4-winner-item b { color: var(--sfa4-gold); }
.sfa4-winner-item .sfa4-coins { color: var(--sfa4-primary); }

/* ---------- Promo text link ---------- */
.sfa4-text-link { color: var(--sfa4-primary); font-weight: 700; border-bottom: 1px dashed var(--sfa4-primary); cursor: pointer; }
.sfa4-callout {
  background: linear-gradient(135deg, rgba(64,224,208,.12), rgba(32,178,170,.08));
  border: 1px solid var(--sfa4-primary); border-radius: var(--sfa4-radius);
  padding: 1.4rem; text-align: center; margin: 1.6rem 0;
}
.sfa4-callout p { color: var(--sfa4-text); font-size: 1.3rem; margin-bottom: 1rem; }

/* ---------- Footer ---------- */
.sfa4-footer { background: var(--sfa4-bg-2); border-top: 1px solid var(--sfa4-border); padding: 2.4rem 0 1.5rem; margin-top: 2rem; }
.sfa4-footer p { color: var(--sfa4-muted); font-size: 1.2rem; line-height: 1.55; margin-bottom: 1rem; }
.sfa4-footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; margin: 1.2rem 0; }
.sfa4-footer-links a { color: var(--sfa4-text); font-size: 1.15rem; padding: .55rem .8rem; background: var(--sfa4-card); border-radius: 8px; border: 1px solid var(--sfa4-border); }
.sfa4-footer-promos { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1rem 0; }
.sfa4-footer-copy { text-align: center; color: var(--sfa4-muted); font-size: 1.1rem; padding-top: 1.2rem; border-top: 1px solid var(--sfa4-border); }

/* ---------- Bottom nav (mobile only) ---------- */
.sfa4-bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000;
  background: linear-gradient(180deg, rgba(13, 27, 36, .98), rgba(8, 18, 25, .99));
  border-top: 1px solid var(--sfa4-border);
  display: flex; justify-content: space-around; align-items: stretch;
  padding: .35rem 0; height: 62px;
}
.sfa4-bottom-nav-btn {
  flex: 1; min-width: 60px; min-height: 60px;
  background: transparent; border: none; color: var(--sfa4-muted);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  font-size: 1rem; cursor: pointer; transition: color .18s ease, transform .18s ease;
}
.sfa4-bottom-nav-btn i, .sfa4-bottom-nav-btn span.material-icons-outlined { font-size: 22px; }
.sfa4-bottom-nav-btn .sfa4-bn-label { font-size: 1rem; font-weight: 600; }
.sfa4-bottom-nav-btn:hover { color: var(--sfa4-primary); }
.sfa4-bottom-nav-active { color: var(--sfa4-primary); }
.sfa4-bottom-nav-active::after {
  content: ''; width: 26px; height: 3px; border-radius: 3px;
  background: var(--sfa4-primary); margin-top: 2px;
}
.sfa4-bn-promo { color: var(--sfa4-gold); }
@media (min-width: 769px) { .sfa4-bottom-nav { display: none; } }

/* ---------- Desktop tweaks ---------- */
@media (min-width: 769px) {
  .sfa4-container { max-width: 720px; }
  .sfa4-header-row, .sfa4-nav-list { max-width: 720px; }
  .sfa4-game-grid { grid-template-columns: repeat(5, 1fr); }
  .sfa4-feature-grid { grid-template-columns: 1fr 1fr; }
  .sfa4-footer-links { grid-template-columns: repeat(3, 1fr); }
}