/* ============================================================
   ex88 - Vietnamese gaming website core stylesheet
   Prefix: sf0b-
   Palette: #9966CC | #DEB887 | #9400D3 | #1C2833 | #FFF8DC
   Mobile-first, max-width 430px container.
   ============================================================ */

:root {
  --sf0b-primary: #9966CC;
  --sf0b-accent: #DEB887;
  --sf0b-secondary: #9400D3;
  --sf0b-bg: #1C2833;
  --sf0b-bg-2: #232b3a;
  --sf0b-bg-3: #2c3447;
  --sf0b-text: #FFF8DC;
  --sf0b-text-muted: #c9b990;
  --sf0b-white: #ffffff;
  --sf0b-shadow: 0 4px 18px rgba(0,0,0,.45);
  --sf0b-radius: 14px;
  --sf0b-radius-sm: 8px;
  --sf0b-header-h: 56px;
  --sf0b-bnav-h: 62px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 62.5%; scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top, #243042 0%, var(--sf0b-bg) 70%);
  color: var(--sf0b-text);
  line-height: 1.5rem;
  font-size: 1.4rem;
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--sf0b-accent); text-decoration: none; }

/* ============================================================
   Layout containers
   ============================================================ */
.sf0b-container {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 0 14px;
}

.sf0b-wrapper {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
}

main { padding-bottom: 80px; }

/* ============================================================
   Header
   ============================================================ */
.sf0b-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--sf0b-header-h);
  background: linear-gradient(90deg, var(--sf0b-bg-2), #1a2233);
  border-bottom: 1px solid rgba(153,102,204,.35);
  z-index: 1000;
  box-shadow: var(--sf0b-shadow);
}

.sf0b-header-inner {
  max-width: 430px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
}

.sf0b-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--sf0b-text);
  font-weight: 700;
  font-size: 1.8rem;
  letter-spacing: .5px;
}

.sf0b-logo img {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--sf0b-accent);
}

.sf0b-logo span {
  color: var(--sf0b-accent);
}

.sf0b-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sf0b-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 1.3rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, opacity .15s;
  min-height: 36px;
  font-family: inherit;
}

.sf0b-btn:active { transform: scale(.94); }

.sf0b-btn-primary {
  background: linear-gradient(135deg, var(--sf0b-primary), var(--sf0b-secondary));
  color: var(--sf0b-white);
  box-shadow: 0 2px 12px rgba(148,0,211,.4);
}

.sf0b-btn-ghost {
  background: transparent;
  color: var(--sf0b-text);
  border: 1.5px solid var(--sf0b-accent);
}

.sf0b-menu-btn {
  background: transparent;
  border: none;
  color: var(--sf0b-text);
  font-size: 2rem;
  cursor: pointer;
  padding: 6px 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   Mobile slide-down menu
   ============================================================ */
.sf0b-mobile-menu {
  position: fixed;
  top: var(--sf0b-header-h);
  left: 0; right: 0;
  max-width: 430px;
  margin: 0 auto;
  background: var(--sf0b-bg-2);
  border-bottom: 1px solid rgba(153,102,204,.3);
  transform: translateY(-130%);
  transition: transform .28s ease;
  z-index: 9999;
  padding: 14px;
  box-shadow: var(--sf0b-shadow);
}

.sf0b-mobile-menu.sf0b-menu-open { transform: translateY(0); }

.sf0b-mobile-menu a {
  display: block;
  padding: 12px 14px;
  color: var(--sf0b-text);
  border-radius: var(--sf0b-radius-sm);
  font-size: 1.4rem;
  margin-bottom: 4px;
  transition: background .15s;
}

.sf0b-mobile-menu a:hover,
.sf0b-mobile-menu a:active {
  background: rgba(153,102,204,.15);
}

.sf0b-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
  z-index: 9998;
}

.sf0b-overlay.sf0b-show {
  opacity: 1;
  pointer-events: auto;
}

/* ============================================================
   Hero / carousel
   ============================================================ */
.sf0b-hero {
  margin-top: var(--sf0b-header-h);
  width: 100%;
  position: relative;
  overflow: hidden;
}

.sf0b-carousel {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
}

.sf0b-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .6s ease;
  cursor: pointer;
}

.sf0b-slide.sf0b-active { opacity: 1; }

.sf0b-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sf0b-slide-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28,40,51,.2) 0%, rgba(28,40,51,.85) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 16px;
}

.sf0b-slide-title {
  color: var(--sf0b-accent);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.sf0b-slide-desc {
  color: var(--sf0b-text);
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.sf0b-carousel-controls {
  position: absolute;
  bottom: 10px;
  left: 0; right: 0;
  display: flex;
  justify-content: center;
  gap: 6px;
  z-index: 2;
}

.sf0b-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,248,220,.4);
  border: none;
  cursor: pointer;
  transition: background .2s, transform .2s;
}

.sf0b-dot.sf0b-dot-active {
  background: var(--sf0b-accent);
  transform: scale(1.25);
}

/* ============================================================
   Sections / headings
   ============================================================ */
.sf0b-section {
  padding: 22px 0 10px;
}

.sf0b-section-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--sf0b-accent);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-left: 4px solid var(--sf0b-primary);
  padding-left: 10px;
}

.sf0b-h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--sf0b-text);
  margin: 16px 0 10px;
  line-height: 1.35;
}

.sf0b-h1 span { color: var(--sf0b-accent); }

.sf0b-lead {
  font-size: 1.35rem;
  color: var(--sf0b-text-muted);
  margin-bottom: 14px;
}

/* ============================================================
   Category tabs
   ============================================================ */
.sf0b-cat-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 6px 0 12px;
  scrollbar-width: none;
}

.sf0b-cat-tabs::-webkit-scrollbar { display: none; }

.sf0b-cat-tab {
  flex: 0 0 auto;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--sf0b-bg-3);
  color: var(--sf0b-text);
  font-size: 1.25rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: background .15s, color .15s, border-color .15s;
}

.sf0b-cat-tab.sf0b-cat-active {
  background: linear-gradient(135deg, var(--sf0b-primary), var(--sf0b-secondary));
  color: var(--sf0b-white);
  border-color: var(--sf0b-accent);
}

/* ============================================================
   Game grid
   ============================================================ */
.sf0b-game-section { margin-bottom: 26px; }

.sf0b-game-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
}

.sf0b-game-card {
  background: var(--sf0b-bg-2);
  border-radius: var(--sf0b-radius-sm);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  border: 1px solid rgba(153,102,204,.18);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}

.sf0b-game-card:active {
  transform: scale(.96);
  border-color: var(--sf0b-accent);
}

.sf0b-game-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: #0e1620;
}

.sf0b-game-name {
  padding: 6px 8px;
  font-size: 1.15rem;
  color: var(--sf0b-text);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sf0b-game-badge {
  position: absolute;
  top: 4px;
  left: 4px;
  background: linear-gradient(135deg, var(--sf0b-secondary), var(--sf0b-primary));
  color: var(--sf0b-white);
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
}

/* ============================================================
   CTA / promo banner
   ============================================================ */
.sf0b-cta {
  background: linear-gradient(135deg, var(--sf0b-primary), var(--sf0b-secondary));
  border-radius: var(--sf0b-radius);
  padding: 18px;
  text-align: center;
  margin: 20px 0;
  box-shadow: var(--sf0b-shadow);
}

.sf0b-cta h3 {
  color: var(--sf0b-white);
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.sf0b-cta p {
  color: var(--sf0b-text);
  font-size: 1.25rem;
  margin-bottom: 14px;
}

.sf0b-cta .sf0b-btn-primary {
  background: var(--sf0b-accent);
  color: var(--sf0b-bg);
  font-size: 1.4rem;
  padding: 10px 24px;
}

/* ============================================================
   Info cards / features
   ============================================================ */
.sf0b-card {
  background: var(--sf0b-bg-2);
  border-radius: var(--sf0b-radius);
  padding: 14px;
  margin-bottom: 12px;
  border: 1px solid rgba(153,102,204,.18);
}

.sf0b-card h3 {
  color: var(--sf0b-accent);
  font-size: 1.5rem;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sf0b-card p {
  color: var(--sf0b-text);
  font-size: 1.3rem;
  line-height: 1.55;
}

.sf0b-card a { color: var(--sf0b-accent); font-weight: 600; }

.sf0b-feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.sf0b-feature {
  background: var(--sf0b-bg-2);
  border-radius: var(--sf0b-radius-sm);
  padding: 14px 10px;
  text-align: center;
  border: 1px solid rgba(153,102,204,.18);
}

.sf0b-feature i {
  font-size: 2.6rem;
  color: var(--sf0b-accent);
  margin-bottom: 6px;
  display: block;
}

.sf0b-feature h4 {
  color: var(--sf0b-text);
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.sf0b-feature p {
  color: var(--sf0b-text-muted);
  font-size: 1.15rem;
}

/* ============================================================
   Testimonials
   ============================================================ */
.sf0b-testimonial {
  background: var(--sf0b-bg-2);
  border-radius: var(--sf0b-radius);
  padding: 14px;
  margin-bottom: 10px;
  border-left: 3px solid var(--sf0b-accent);
}

.sf0b-testimonial p {
  color: var(--sf0b-text);
  font-size: 1.25rem;
  font-style: italic;
  margin-bottom: 6px;
}

.sf0b-testimonial .sf0b-author {
  color: var(--sf0b-accent);
  font-size: 1.2rem;
  font-weight: 600;
}

/* ============================================================
   Payment methods
   ============================================================ */
.sf0b-pay-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sf0b-pay {
  background: var(--sf0b-bg-3);
  color: var(--sf0b-text);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 1.2rem;
  border: 1px solid rgba(153,102,204,.25);
}

/* ============================================================
   Winners / achievements
   ============================================================ */
.sf0b-winner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--sf0b-bg-2);
  padding: 10px 12px;
  border-radius: var(--sf0b-radius-sm);
  margin-bottom: 6px;
  font-size: 1.2rem;
}

.sf0b-winner strong { color: var(--sf0b-accent); }
.sf0b-winner span { color: var(--sf0b-text-muted); }

/* ============================================================
   Footer
   ============================================================ */
.sf0b-footer {
  background: var(--sf0b-bg-2);
  border-top: 1px solid rgba(153,102,204,.25);
  margin-top: 24px;
  padding: 24px 0 20px;
}

.sf0b-footer h4 {
  color: var(--sf0b-accent);
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.sf0b-footer p {
  color: var(--sf0b-text-muted);
  font-size: 1.2rem;
  margin-bottom: 14px;
  line-height: 1.55;
}

.sf0b-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 14px;
}

.sf0b-footer-links a {
  color: var(--sf0b-text);
  font-size: 1.2rem;
  text-decoration: underline;
}

.sf0b-footer-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.sf0b-copyright {
  color: var(--sf0b-text-muted);
  font-size: 1.15rem;
  text-align: center;
  margin-top: 10px;
  border-top: 1px solid rgba(255,255,255,.06);
  padding-top: 10px;
}

/* ============================================================
   Mobile bottom navigation
   ============================================================ */
.sf0b-bnav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  max-width: 430px;
  margin: 0 auto;
  height: var(--sf0b-bnav-h);
  background: linear-gradient(180deg, #1f2738, #161e2c);
  border-top: 1px solid rgba(153,102,204,.35);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 -4px 18px rgba(0,0,0,.45);
}

.sf0b-bnav-btn {
  flex: 1 1 0;
  min-width: 60px;
  min-height: 60px;
  background: transparent;
  border: none;
  color: var(--sf0b-text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
  padding: 4px;
  transition: color .15s, transform .15s;
}

.sf0b-bnav-btn i {
  font-size: 22px;
  line-height: 1;
}

.sf0b-bnav-btn span {
  font-size: 1rem;
  letter-spacing: .3px;
}

.sf0b-bnav-btn:active {
  transform: scale(.9);
  color: var(--sf0b-accent);
}

.sf0b-bnav-btn.sf0b-bnav-current,
.sf0b-bnav-btn:hover {
  color: var(--sf0b-accent);
}

.sf0b-bnav-promo {
  background: linear-gradient(135deg, var(--sf0b-primary), var(--sf0b-secondary));
  border-radius: 50%;
  width: 48px;
  height: 48px;
  margin-top: -22px;
  box-shadow: 0 0 0 3px var(--sf0b-bg), 0 0 12px rgba(148,0,211,.6);
  color: var(--sf0b-white);
}

.sf0b-bnav-promo i { font-size: 24px; }
.sf0b-bnav-promo span { display: none; }

/* ============================================================
   Utility
   ============================================================ */
.sf0b-text-center { text-align: center; }
.sf0b-mt-10 { margin-top: 10px; }
.sf0b-mb-10 { margin-bottom: 10px; }
.sf0b-hide { display: none !important; }

/* ============================================================
   Desktop - hide bottom nav, expand container
   ============================================================ */
@media (min-width: 769px) {
  .sf0b-bnav { display: none; }
  .sf0b-container,
  .sf0b-wrapper,
  .sf0b-header-inner,
  .sf0b-mobile-menu { max-width: 768px; }
  main { padding-bottom: 30px; }
  .sf0b-carousel { height: 320px; }
  .sf0b-game-grid { grid-template-columns: repeat(5, 1fr); }
  .sf0b-feature-grid { grid-template-columns: repeat(4, 1fr); }
}

/* Small mobile tuning */
@media (max-width: 360px) {
  .sf0b-game-grid { grid-template-columns: repeat(2, 1fr); }
  .sf0b-h1 { font-size: 1.7rem; }
  .sf0b-section-title { font-size: 1.6rem; }
}