/* 13win com app - shared stylesheet (Vietnamese localized site)
   All custom classes use the vb92- prefix. */

:root {
  --vb92-bg: #0E1621;
  --vb92-bg-soft: #142233;
  --vb92-bg-card: #1b2c40;
  --vb92-primary: #2C3E50;
  --vb92-accent: #FFB347;
  --vb92-accent-2: #FF7F50;
  --vb92-dark: #2F2F2F;
  --vb92-text: #f3f5f8;
  --vb92-text-soft: #b9c4d2;
  --vb92-border: rgba(255, 179, 71, 0.25);
  --vb92-shadow: 0 0.6rem 1.8rem rgba(0, 0, 0, 0.45);
  --vb92-radius: 1.2rem;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at top, #16273b 0%, var(--vb92-bg) 60%);
  color: var(--vb92-text);
  line-height: 1.5rem;
  font-size: 1.4rem;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: var(--vb92-accent); text-decoration: none; }

.vb92-container {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 0 1.2rem;
}

.vb92-wrapper {
  padding-top: 6.4rem;
  padding-bottom: 1rem;
}

/* ========= Header ========= */
.vb92-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(14,22,33,0.96), rgba(14,22,33,0.86));
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--vb92-border);
}

.vb92-header-inner {
  max-width: 430px;
  margin: 0 auto;
  padding: 0.7rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.vb92-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-width: 0;
}

.vb92-brand img {
  width: 3rem; height: 3rem; border-radius: 0.6rem;
  border: 1px solid var(--vb92-border);
}

.vb92-brand-name {
  font-weight: 800;
  font-size: 1.5rem;
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  white-space: nowrap;
}

.vb92-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.vb92-btn {
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.25rem;
  padding: 0.65rem 1.1rem;
  border-radius: 0.9rem;
  transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
  min-height: 3.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.vb92-btn:active { transform: scale(0.95); }

.vb92-btn-login {
  background: transparent;
  color: var(--vb92-text);
  border: 1px solid var(--vb92-border);
}

.vb92-btn-register {
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  color: #1a1206;
  box-shadow: 0 0.4rem 1.2rem rgba(255, 127, 80, 0.35);
}

.vb92-menu-toggle {
  background: transparent;
  border: 1px solid var(--vb92-border);
  color: var(--vb92-text);
  width: 3.4rem; height: 3.4rem;
  border-radius: 0.8rem;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
}

/* ========= Expandable nav menu ========= */
.vb92-nav {
  max-width: 430px;
  margin: 0 auto;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.32s ease;
  background: var(--vb92-bg-soft);
  border-top: 1px solid transparent;
}

.vb92-nav.vb92-nav-open {
  max-height: 36rem;
  border-top: 1px solid var(--vb92-border);
}

.vb92-nav-list {
  list-style: none;
  margin: 0;
  padding: 0.6rem 1.2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.vb92-nav-list a {
  display: block;
  padding: 0.8rem 0.9rem;
  font-size: 1.25rem;
  color: var(--vb92-text-soft);
  background: var(--vb92-bg-card);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 0.7rem;
}

.vb92-nav-list a:hover { color: var(--vb92-accent); }

/* ========= Hero / Carousel ========= */
.vb92-carousel {
  position: relative;
  border-radius: var(--vb92-radius);
  overflow: hidden;
  margin: 1rem 0;
  box-shadow: var(--vb92-shadow);
}

.vb92-slides { position: relative; }

.vb92-slide {
  position: relative;
  display: none;
  cursor: pointer;
}

.vb92-slide img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}

.vb92-slide-active { display: block; }

.vb92-slide-caption {
  position: absolute;
  left: 1rem; right: 1rem; bottom: 1rem;
  background: linear-gradient(0deg, rgba(0,0,0,0.7), transparent);
  color: #fff;
  padding: 1.4rem 0.8rem 0.6rem;
  font-weight: 700;
  font-size: 1.35rem;
}

.vb92-dots {
  position: absolute;
  bottom: 0.6rem; left: 0; right: 0;
  display: flex; justify-content: center; gap: 0.4rem;
}

.vb92-dot {
  width: 0.7rem; height: 0.7rem;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
}

.vb92-dot-active { background: var(--vb92-accent); }

/* ========= Section / headings ========= */
.vb92-section {
  margin: 2rem 0;
  scroll-margin-top: 7rem;
}

.vb92-h1 {
  font-size: 2rem;
  margin: 0.4rem 0 0.8rem;
  line-height: 1.3;
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.vb92-h2 {
  font-size: 1.6rem;
  margin: 1.4rem 0 0.7rem;
  color: var(--vb92-accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.vb92-h3 {
  font-size: 1.35rem;
  margin: 1rem 0 0.4rem;
  color: var(--vb92-text);
}

.vb92-lead {
  color: var(--vb92-text-soft);
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
}

/* ========= Filter tabs ========= */
.vb92-filter {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding: 0.4rem 0 0.8rem;
  -webkit-overflow-scrolling: touch;
}

.vb92-filter-tab {
  border: 1px solid var(--vb92-border);
  background: var(--vb92-bg-card);
  color: var(--vb92-text-soft);
  padding: 0.55rem 0.9rem;
  border-radius: 0.9rem;
  font-size: 1.2rem;
  cursor: pointer;
  white-space: nowrap;
}

.vb92-filter-active {
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  color: #1a1206;
  border-color: transparent;
  font-weight: 700;
}

/* ========= Game grid ========= */
.vb92-game-group { margin: 1.4rem 0; }

.vb92-game-group-title {
  font-size: 1.4rem;
  color: var(--vb92-accent);
  margin: 0.6rem 0;
  font-weight: 700;
  display: flex; align-items: center; gap: 0.4rem;
}

.vb92-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.vb92-card {
  background: var(--vb92-bg-card);
  border-radius: 0.9rem;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.04);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-align: center;
}

.vb92-card:active { transform: scale(0.96); }

.vb92-card img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
}

.vb92-card-name {
  font-size: 1.05rem;
  padding: 0.35rem 0.3rem 0.5rem;
  color: var(--vb92-text-soft);
  line-height: 1.2;
  min-height: 2.8rem;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ========= Promo / feature / cta ========= */
.vb92-promo-link {
  color: var(--vb92-accent);
  font-weight: 700;
  cursor: pointer;
}

.vb92-cta {
  display: block;
  text-align: center;
  margin: 1.2rem 0;
  padding: 1.1rem;
  border-radius: 1rem;
  font-weight: 800;
  font-size: 1.4rem;
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  color: #1a1206;
  box-shadow: 0 0.5rem 1.4rem rgba(255,127,80,0.3);
  cursor: pointer;
}

.vb92-feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin: 0.8rem 0;
}

.vb92-feature {
  background: var(--vb92-bg-card);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 0.9rem;
  padding: 0.9rem;
}

.vb92-feature .material-icons,
.vb92-feature i { color: var(--vb92-accent); font-size: 2rem; }

.vb92-feature h3 { margin: 0.4rem 0 0.2rem; font-size: 1.25rem; }
.vb92-feature p { margin: 0; color: var(--vb92-text-soft); font-size: 1.15rem; }

/* ========= FAQ ========= */
.vb92-faq-item {
  background: var(--vb92-bg-card);
  border-radius: 0.8rem;
  padding: 0.8rem 1rem;
  margin-bottom: 0.6rem;
  border: 1px solid rgba(255,255,255,0.04);
}

.vb92-faq-item h3 { margin: 0 0 0.3rem; color: var(--vb92-accent); font-size: 1.2rem; }
.vb92-faq-item p { margin: 0; color: var(--vb92-text-soft); font-size: 1.15rem; }

/* ========= Footer ========= */
.vb92-footer {
  margin-top: 2rem;
  padding: 1.6rem 1.2rem 9rem;
  background: var(--vb92-bg-soft);
  border-top: 1px solid var(--vb92-border);
}

.vb92-footer-inner { max-width: 430px; margin: 0 auto; }

.vb92-footer-brand { color: var(--vb92-text-soft); font-size: 1.2rem; margin-bottom: 0.8rem; }

.vb92-footer-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem 0.8rem;
  margin: 0.6rem 0;
}

.vb92-footer-links a {
  color: var(--vb92-text-soft);
  font-size: 1.15rem;
  padding: 0.2rem 0;
}

.vb92-footer-promos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.8rem 0;
}

.vb92-footer-promos button {
  background: linear-gradient(90deg, var(--vb92-accent), var(--vb92-accent-2));
  color: #1a1206;
  border: none;
  border-radius: 0.7rem;
  padding: 0.55rem 0.9rem;
  font-weight: 700;
  font-size: 1.15rem;
  cursor: pointer;
}

.vb92-copyright {
  color: var(--vb92-text-soft);
  font-size: 1.1rem;
  margin-top: 0.8rem;
  text-align: center;
}

/* ========= Bottom nav (mobile only) ========= */
.vb92-bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 1000;
  height: 6rem;
  background: linear-gradient(180deg, rgba(20,34,51,0.98), rgba(14,22,33,1));
  border-top: 1px solid var(--vb92-border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 0.3rem 0.2rem;
}

.vb92-bottom-btn {
  flex: 1;
  min-width: 6rem;
  min-height: 5.6rem;
  background: transparent;
  border: none;
  color: var(--vb92-text-soft);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  cursor: pointer;
  border-radius: 0.8rem;
  transition: transform 0.18s ease, color 0.18s ease;
}

.vb92-bottom-btn:active { transform: scale(0.92); }

.vb92-bottom-btn i,
.vb92-bottom-btn .material-icons {
  font-size: 2.2rem;
}

.vb92-bottom-btn span {
  font-size: 1rem;
  font-weight: 600;
}

.vb92-bottom-active {
  color: var(--vb92-accent);
}

.vb92-bottom-promo {
  color: var(--vb92-accent-2);
}

/* Desktop: hide bottom nav, widen container */
@media (min-width: 769px) {
  .vb92-bottom-nav { display: none; }
  .vb92-container { max-width: 760px; }
  .vb92-header-inner { max-width: 760px; }
  .vb92-nav { max-width: 760px; }
  .vb92-footer-inner { max-width: 760px; }
  .vb92-footer { padding-bottom: 2rem; }
  body { font-size: 1.5rem; }
}

/* Mobile bottom padding so content isn't hidden behind bottom nav */
@media (max-width: 768px) {
  main { padding-bottom: 8rem; }
  .vb92-grid { grid-template-columns: repeat(3, 1fr); }
}