/*!
 * xxcc.click base stylesheet
 * Mobile-first canvas (320-430px). Centered phone frame on wider screens.
 * All class names and CSS variables use the "ui4b-" prefix.
 * Code comments are intentionally in English.
 */

:root {
  --ui4b-accent: #ADFF22;        /* primary lime accent */
  --ui4b-accent-2: #7CFC00;      /* secondary green */
  --ui4b-base: #3A3A3A;          /* dark neutral base */
  --ui4b-bg: #15171a;            /* page background */
  --ui4b-bg-2: #1d2024;          /* card background */
  --ui4b-bg-3: #262a30;          /* hover surface */
  --ui4b-line: #34373d;          /* hairline border */
  --ui4b-text: #f3f5f0;          /* primary text */
  --ui4b-muted: #a7ad9a;         /* muted text */
  --ui4b-gold: #ffd34d;          /* promotional highlight */
  --ui4b-danger: #ff5a4d;
  --ui4b-radius: 12px;
  --ui4b-radius-lg: 18px;
  --ui4b-shadow: 0 8px 22px rgba(0, 0, 0, 0.35);
  --ui4b-header-h: 58px;
  --ui4b-bnav-h: 70px;
  --ui4b-max: 460px;
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "Hind Siliguri", "Noto Sans Bengali", "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--ui4b-bg);
  color: var(--ui4b-text);
  font-size: 15px;
  line-height: 1.55;
  overflow-x: hidden;
  min-height: 100vh;
}
img { max-width: 100%; display: block; }
a { color: var(--ui4b-accent); text-decoration: none; }
a:focus, button:focus { outline: 2px solid var(--ui4b-accent-2); outline-offset: 2px; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.3; font-weight: 700; }

/* ---------- Mobile canvas frame ---------- */
.ui4b-shell {
  max-width: var(--ui4b-max);
  margin: 0 auto;
  background: var(--ui4b-bg);
  min-height: 100vh;
  position: relative;
  box-shadow: 0 0 40px rgba(0, 0, 0, 0.45);
}
.ui4b-body--no-scroll { overflow: hidden; }

/* ---------- Header (标识式顶部栏) ---------- */
.ui4b-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  height: var(--ui4b-header-h);
  background: linear-gradient(180deg, rgba(21,23,26,0.98), rgba(21,23,26,0.88));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ui4b-line);
  transition: height 0.25s ease, padding 0.25s ease;
}
.ui4b-header--compact { height: 50px; padding: 6px 12px; }

.ui4b-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}
.ui4b-brand-img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  background: var(--ui4b-bg-2);
  border: 1px solid var(--ui4b-accent-2);
  flex-shrink: 0;
}
.ui4b-brand-name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 0;
}
.ui4b-brand-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--ui4b-text);
  letter-spacing: 0.3px;
  white-space: nowrap;
}
.ui4b-brand-sub {
  font-size: 10px;
  color: var(--ui4b-accent-2);
  white-space: nowrap;
}

.ui4b-header-actions { display: flex; align-items: center; gap: 6px; }
.ui4b-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  white-space: nowrap;
  min-height: 34px;
}
.ui4b-btn:active { transform: translateY(1px); }
.ui4b-btn--login {
  background: var(--ui4b-bg-3);
  color: var(--ui4b-text);
  border: 1px solid var(--ui4b-line);
}
.ui4b-btn--register {
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  color: #14160f;
  box-shadow: 0 4px 12px rgba(124, 252, 0, 0.28);
}
.ui4b-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ui4b-bg-3);
  color: var(--ui4b-text);
  border: 1px solid var(--ui4b-line);
}
.ui4b-icon-btn svg { width: 20px; height: 20px; }

/* ---------- Side drawer (侧边抽屉) ---------- */
.ui4b-drawer {
  position: fixed;
  top: 0;
  right: -82%;
  width: 78%;
  max-width: 320px;
  height: 100vh;
  background: var(--ui4b-bg-2);
  z-index: 90;
  transform: translateX(0);
  transition: right 0.28s ease;
  display: flex;
  flex-direction: column;
  padding: 16px;
  overflow-y: auto;
  border-left: 1px solid var(--ui4b-line);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.4);
}
.ui4b-drawer--open { right: 0; }
.ui4b-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ui4b-line);
  margin-bottom: 12px;
}
.ui4b-drawer-title { font-size: 16px; font-weight: 800; }
.ui4b-drawer-close {
  width: 32px; height: 32px; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--ui4b-bg-3); border: 1px solid var(--ui4b-line);
}
.ui4b-drawer-close svg { width: 16px; height: 16px; }
.ui4b-drawer-section { margin-bottom: 16px; }
.ui4b-drawer-heading {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--ui4b-muted);
  margin-bottom: 8px;
  padding: 0 4px;
}
.ui4b-drawer-item {
  display: block;
  padding: 11px 12px;
  border-radius: 10px;
  color: var(--ui4b-text);
  font-size: 14px;
  margin-bottom: 4px;
  background: var(--ui4b-bg-3);
  border: 1px solid var(--ui4b-line);
  transition: background 0.15s ease, border-color 0.15s ease;
}
.ui4b-drawer-item:active { background: var(--ui4b-line); }
.ui4b-drawer-promo {
  display: block;
  text-align: center;
  padding: 12px;
  border-radius: 12px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  color: #14160f;
  margin-top: 8px;
}

.ui4b-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 80;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s ease;
}
.ui4b-overlay--visible { opacity: 1; visibility: visible; }

/* ---------- Main content ---------- */
.ui4b-main {
  padding: 12px 12px calc(var(--ui4b-bnav-h) + 24px);
}

/* ---------- Hero carousel ---------- */
.ui4b-hero {
  position: relative;
  border-radius: var(--ui4b-radius-lg);
  overflow: hidden;
  margin-bottom: 14px;
  box-shadow: var(--ui4b-shadow);
  background: var(--ui4b-bg-2);
  aspect-ratio: 16 / 9;
}
.ui4b-slides { position: relative; width: 100%; height: 100%; }
.ui4b-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
}
.ui4b-slide--active { opacity: 1; }
.ui4b-slide img { width: 100%; height: 100%; object-fit: cover; }
.ui4b-slide-cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  right: 12px;
  background: linear-gradient(0deg, rgba(0,0,0,0.78), rgba(0,0,0,0));
  padding: 28px 12px 8px;
  border-radius: 0 0 var(--ui4b-radius-lg) var(--ui4b-radius-lg);
}
.ui4b-slide-cap h2 { font-size: 17px; color: #fff; margin-bottom: 4px; }
.ui4b-slide-cap p { font-size: 12px; color: #e6e8df; margin: 0; }
.ui4b-slide-cta {
  position: absolute;
  right: 10px;
  bottom: 10px;
  background: var(--ui4b-accent);
  color: #14160f;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}
.ui4b-hero-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.45);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  z-index: 5;
  border: 1px solid rgba(255,255,255,0.25);
}
.ui4b-hero-arrow svg { width: 18px; height: 18px; }
.ui4b-hero-prev { left: 8px; }
.ui4b-hero-next { right: 8px; }
.ui4b-dots {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 8px;
  display: flex;
  gap: 6px;
  z-index: 6;
}
.ui4b-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transition: background 0.2s ease, width 0.2s ease;
}
.ui4b-dot--active { background: var(--ui4b-accent); width: 18px; border-radius: 999px; }

/* ---------- Category chips ---------- */
.ui4b-cats {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  margin: 0 -12px 14px;
  padding: 4px 12px 8px;
  scrollbar-width: none;
}
.ui4b-cats::-webkit-scrollbar { display: none; }
.ui4b-cat-chip {
  flex-shrink: 0;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--ui4b-bg-2);
  border: 1px solid var(--ui4b-line);
  color: var(--ui4b-text);
  font-size: 13px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.ui4b-cat-chip svg { width: 14px; height: 14px; color: var(--ui4b-accent-2); }

/* ---------- Section ---------- */
.ui4b-section { margin-bottom: 22px; }
.ui4b-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  padding: 0 2px;
}
.ui4b-section-title {
  font-size: 17px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.ui4b-section-title::before {
  content: "";
  width: 4px;
  height: 18px;
  background: linear-gradient(180deg, var(--ui4b-accent), var(--ui4b-accent-2));
  border-radius: 2px;
}
.ui4b-section-link {
  font-size: 12px;
  color: var(--ui4b-accent);
  font-weight: 600;
}

/* ---------- Game grid (紧凑手机网格) ---------- */
.ui4b-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
@media (min-width: 360px) {
  .ui4b-grid { grid-template-columns: repeat(4, 1fr); gap: 10px; }
}
@media (min-width: 400px) {
  .ui4b-grid { grid-template-columns: repeat(5, 1fr); }
}
.ui4b-game-card {
  background: var(--ui4b-bg-2);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--ui4b-line);
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  opacity: 0.35;
  transform: translateY(6px);
}
.ui4b-game-card--seen { opacity: 1; transform: translateY(0); }
.ui4b-game-card:active { transform: scale(0.96); border-color: var(--ui4b-accent-2); }
.ui4b-game-thumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--ui4b-bg-3);
  overflow: hidden;
}
.ui4b-game-thumb img { width: 100%; height: 100%; object-fit: cover; }
.ui4b-game-name {
  font-size: 11px;
  font-weight: 600;
  text-align: center;
  padding: 5px 4px;
  color: var(--ui4b-text);
  line-height: 1.25;
  min-height: 28px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
}

/* ---------- Info / promo banner block ---------- */
.ui4b-promo-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.ui4b-promo-card {
  border-radius: var(--ui4b-radius);
  padding: 14px 12px;
  background: linear-gradient(135deg, #1d2024, #262a30);
  border: 1px solid var(--ui4b-line);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}
.ui4b-promo-card::after {
  content: "";
  position: absolute;
  right: -20px; top: -20px;
  width: 80px; height: 80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,252,0,0.18), transparent 70%);
}
.ui4b-promo-card .ui4b-promo-tag {
  font-size: 10px;
  color: var(--ui4b-accent-2);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.ui4b-promo-card h3 { font-size: 15px; margin: 4px 0 6px; }
.ui4b-promo-card p { font-size: 12px; color: var(--ui4b-muted); margin: 0; }
.ui4b-promo-cta {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--ui4b-accent);
  color: #14160f;
}

/* ---------- Winners ---------- */
.ui4b-winners {
  background: var(--ui4b-bg-2);
  border-radius: var(--ui4b-radius);
  border: 1px solid var(--ui4b-line);
  padding: 12px;
  margin-bottom: 22px;
}
.ui4b-winner-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--ui4b-line);
}
.ui4b-winner-item:last-child { border-bottom: none; }
.ui4b-winner-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #14160f;
  font-weight: 800;
  font-size: 13px;
  flex-shrink: 0;
}
.ui4b-winner-meta { flex: 1; min-width: 0; font-size: 12px; }
.ui4b-winner-meta strong { color: var(--ui4b-text); font-size: 13px; }
.ui4b-winner-meta span { color: var(--ui4b-muted); display: block; font-size: 11px; }
.ui4b-winner-amount {
  font-weight: 800;
  color: var(--ui4b-gold);
  font-size: 13px;
  white-space: nowrap;
}

/* ---------- Testimonials ---------- */
.ui4b-testi-list { display: grid; gap: 10px; margin-bottom: 22px; }
.ui4b-testi {
  background: var(--ui4b-bg-2);
  border: 1px solid var(--ui4b-line);
  border-radius: var(--ui4b-radius);
  padding: 12px;
}
.ui4b-testi-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.ui4b-testi-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--ui4b-bg-3);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 800; color: var(--ui4b-accent-2);
}
.ui4b-testi-name { font-size: 13px; font-weight: 700; }
.ui4b-testi-stars { color: var(--ui4b-gold); font-size: 12px; margin-left: auto; }
.ui4b-testi-text { font-size: 12px; color: var(--ui4b-muted); }

/* ---------- SEO content ---------- */
.ui4b-content {
  background: var(--ui4b-bg-2);
  border-radius: var(--ui4b-radius);
  border: 1px solid var(--ui4b-line);
  padding: 14px;
  margin-bottom: 22px;
  font-size: 14px;
  color: #d6d8cf;
}
.ui4b-content h2 { font-size: 16px; margin: 12px 0 8px; color: var(--ui4b-text); }
.ui4b-content h2:first-child { margin-top: 0; }
.ui4b-content p { margin: 0 0 10px; }
.ui4b-content a { color: var(--ui4b-accent); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- How to play steps ---------- */
.ui4b-steps {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}
.ui4b-step {
  display: flex;
  gap: 12px;
  background: var(--ui4b-bg-2);
  border: 1px solid var(--ui4b-line);
  border-radius: var(--ui4b-radius);
  padding: 12px;
}
.ui4b-step-num {
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  color: #14160f;
  font-weight: 800;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.ui4b-step-body strong { display: block; font-size: 14px; margin-bottom: 2px; }
.ui4b-step-body span { font-size: 12px; color: var(--ui4b-muted); }

/* ---------- Extended homepage footer ---------- */
.ui4b-ext-footer {
  background: linear-gradient(180deg, var(--ui4b-bg-2), #15171a);
  border: 1px solid var(--ui4b-line);
  border-radius: var(--ui4b-radius-lg);
  padding: 16px;
  margin-bottom: 18px;
}
.ui4b-ext-block { margin-bottom: 16px; }
.ui4b-ext-block:last-child { margin-bottom: 0; }
.ui4b-ext-block h4 {
  font-size: 13px;
  color: var(--ui4b-accent-2);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.ui4b-ext-block p { font-size: 12px; color: var(--ui4b-muted); margin: 0 0 8px; }
.ui4b-ext-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.ui4b-ext-links a {
  font-size: 12px;
  padding: 8px 10px;
  background: var(--ui4b-bg-3);
  border: 1px solid var(--ui4b-line);
  border-radius: 8px;
  color: var(--ui4b-text);
  text-decoration: none;
}
.ui4b-ext-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.ui4b-ext-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: 10px;
  background: var(--ui4b-bg-3);
  border: 1px solid var(--ui4b-line);
  font-size: 12px;
  font-weight: 700;
  color: var(--ui4b-text);
}
.ui4b-ext-action--primary {
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  color: #14160f;
  grid-column: span 2;
}
.ui4b-ext-disclaimer {
  font-size: 11px;
  color: var(--ui4b-muted);
  border-top: 1px dashed var(--ui4b-line);
  padding-top: 10px;
  line-height: 1.55;
}

/* ---------- Bottom footer ---------- */
.ui4b-footer {
  text-align: center;
  padding: 14px 12px 18px;
  font-size: 11px;
  color: var(--ui4b-muted);
  border-top: 1px solid var(--ui4b-line);
}
.ui4b-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 12px;
  margin-bottom: 8px;
}
.ui4b-footer-links a { color: var(--ui4b-muted); font-size: 11px; }

/* ---------- Bottom navigation (中央抻升式) ---------- */
.ui4b-bnav {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 100%;
  max-width: var(--ui4b-max);
  height: var(--ui4b-bnav-h);
  background: linear-gradient(180deg, rgba(29,32,36,0.96), rgba(21,23,26,0.99));
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--ui4b-line);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 6px 4px 8px;
  z-index: 70;
}
.ui4b-bnav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  color: var(--ui4b-muted);
  font-size: 10px;
  gap: 3px;
  padding: 4px 2px;
  position: relative;
  border-radius: 12px;
  transition: color 0.18s ease;
}
.ui4b-bnav-btn svg { width: 22px; height: 22px; transition: transform 0.18s ease; }
.ui4b-bnav-btn--active { color: var(--ui4b-accent); }
.ui4b-bnav-btn--active svg { filter: drop-shadow(0 0 6px rgba(124, 252, 0, 0.55)); }
.ui4b-bnav-btn--primary {
  flex: 1.2;
  transform: translateY(-14px);
  color: #14160f;
}
.ui4b-bnav-btn--primary .ui4b-bnav-icon-wrap {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--ui4b-accent), var(--ui4b-accent-2));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(124, 252, 0, 0.45);
  border: 3px solid var(--ui4b-bg);
}
.ui4b-bnav-btn--primary .ui4b-bnav-icon-wrap svg { width: 22px; height: 22px; color: #14160f; }
.ui4b-bnav-btn--primary span { color: var(--ui4b-accent); font-weight: 700; }
.ui4b-bnav-label { line-height: 1; }

/* ---------- Scroll to top ---------- */
.ui4b-top-btn {
  position: fixed;
  right: 14px;
  bottom: calc(var(--ui4b-bnav-h) + 12px);
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--ui4b-bg-3);
  border: 1px solid var(--ui4b-accent-2);
  color: var(--ui4b-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  box-shadow: var(--ui4b-shadow);
}
.ui4b-top-btn--visible { opacity: 1; visibility: visible; }
.ui4b-top-btn svg { width: 18px; height: 18px; }

/* ---------- Utility ---------- */
.ui4b-sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}