/* =====================================================================
   b124 - design.css
   Mobile-first design system for b124.click (Vietnamese / vi-VN).
   All custom classes use the "vea4-" prefix.
   Palette: #F5F5F5 | #2C3E50 | #0A0A0A | #FF1493 | #CD5C5C
   ===================================================================== */

:root {
  --vea4-bg: #0A0A0A;
  --vea4-bg-2: #151515;
  --vea4-surface: #1f1f24;
  --vea4-primary: #FF1493;
  --vea4-primary-2: #CD5C5C;
  --vea4-text: #F5F5F5;
  --vea4-text-dim: #b9b9c0;
  --vea4-dark: #2C3E50;
  --vea4-line: rgba(255, 255, 255, 0.08);
  --vea4-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  --vea4-radius: 14px;
}

* { box-sizing: border-box; }

html { font-size: 62.5%; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", system-ui, -apple-system, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -100px, #1a1a22 0%, var(--vea4-bg) 60%);
  color: var(--vea4-text);
  line-height: 1.5rem;
  font-size: 1.4rem;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ----- Layout container (mobile-first, max 430px) ----- */
.vea4-wrapper {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  padding: 0 1.4rem;
}

.vea4-container {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
}

main { padding-bottom: 9rem; }

/* ----- Header ----- */
.vea4-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(10,10,10,0.96), rgba(10,10,10,0.88));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--vea4-line);
}
.vea4-header-row {
  max-width: 430px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1.2rem;
}
.vea4-logo { display: flex; align-items: center; gap: 0.7rem; flex: 1; min-width: 0; }
.vea4-logo img { width: 28px; height: 28px; border-radius: 8px; }
.vea4-logo .vea4-brand {
  font-size: 1.7rem; font-weight: 800; letter-spacing: 0.4px;
  background: linear-gradient(90deg, var(--vea4-primary), #ff8ac4);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.vea4-logo .vea4-domain { font-size: 1.05rem; color: var(--vea4-text-dim); }

.vea4-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 40px; padding: 0 1.4rem;
  border: none; border-radius: 999px; cursor: pointer;
  font-size: 1.3rem; font-weight: 700; color: #fff;
  transition: transform 0.15s ease, box-shadow 0.2s ease, filter 0.2s ease;
  touch-action: manipulation;
}
.vea4-btn:active { transform: scale(0.95); }
.vea4-btn-primary { background: linear-gradient(90deg, var(--vea4-primary), #ff5fa8); box-shadow: 0 6px 18px rgba(255,20,147,0.35); }
.vea4-btn-ghost { background: rgba(255,255,255,0.08); border: 1px solid var(--vea4-line); color: var(--vea4-text); }
.vea4-btn-block { display: flex; width: 100%; }

.vea4-icon-btn {
  width: 40px; height: 40px; border-radius: 12px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--vea4-line);
  color: var(--vea4-text); display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; font-size: 1.8rem;
}

/* ----- Mobile menu (expandable) ----- */
.vea4-mobile-menu {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease;
  background: var(--vea4-bg-2);
  border-top: 1px solid var(--vea4-line);
}
.vea4-mobile-menu.vea4-open { max-height: 460px; }
.vea4-mobile-menu .vea4-menu-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 0.8rem; padding: 1.2rem 1.4rem;
  max-width: 430px; margin: 0 auto;
}
.vea4-mobile-menu a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 1rem; border-radius: 10px;
  background: var(--vea4-surface); color: var(--vea4-text);
  font-size: 1.25rem; font-weight: 600; border: 1px solid var(--vea4-line);
}
.vea4-mobile-menu a:active { background: rgba(255,20,147,0.15); }

/* ----- Hero carousel ----- */
.vea4-hero {
  position: relative; margin: 1.2rem 0; border-radius: var(--vea4-radius);
  overflow: hidden; box-shadow: var(--vea4-shadow);
  aspect-ratio: 16 / 9;
}
.vea4-hero-slide {
  position: absolute; inset: 0; opacity: 0; transition: opacity 0.6s ease;
  cursor: pointer;
}
.vea4-hero-slide.vea4-active { opacity: 1; }
.vea4-hero-slide img { width: 100%; height: 100%; object-fit: cover; }
.vea4-hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 50%, rgba(0,0,0,0.45));
  pointer-events: none;
}

/* ----- Section titles ----- */
.vea4-section { margin: 2.4rem 0; }
.vea4-section-title {
  font-size: 1.7rem; font-weight: 800; margin: 0 0 1rem 0;
  display: flex; align-items: center; gap: 0.6rem;
}
.vea4-section-title i { color: var(--vea4-primary); font-size: 1.9rem; }
.vea4-section-sub { color: var(--vea4-text-dim); font-size: 1.2rem; margin: -0.4rem 0 1rem 0; }

.vea4-h1 {
  font-size: 2rem; line-height: 1.35; font-weight: 800; margin: 1.4rem 0;
}
.vea4-lead { color: var(--vea4-text-dim); font-size: 1.25rem; }

/* ----- Card ----- */
.vea4-card {
  background: var(--vea4-surface);
  border: 1px solid var(--vea4-line);
  border-radius: var(--vea4-radius);
  padding: 1.4rem;
  box-shadow: var(--vea4-shadow);
}
.vea4-card h3 { margin: 0 0 0.6rem 0; font-size: 1.4rem; }
.vea4-card p { margin: 0; color: var(--vea4-text-dim); font-size: 1.2rem; }

.vea4-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem;
}
.vea4-grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ----- Game grid ----- */
.vea4-cat-head {
  display: flex; align-items: center; justify-content: space-between;
  margin: 1.6rem 0 0.8rem 0;
}
.vea4-cat-head h2 {
  font-size: 1.5rem; margin: 0; font-weight: 800;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.vea4-cat-tag {
  font-size: 1.05rem; color: var(--vea4-text-dim);
  background: rgba(255,255,255,0.06); padding: 0.3rem 0.8rem; border-radius: 999px;
}

.vea4-games {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem;
}
.vea4-game {
  display: block; background: var(--vea4-surface); border-radius: 12px;
  overflow: hidden; border: 1px solid var(--vea4-line);
  cursor: pointer; transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.vea4-game:active { transform: scale(0.96); }
.vea4-game img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.vea4-game-name {
  padding: 0.5rem 0.4rem; font-size: 1.05rem; text-align: center;
  color: var(--vea4-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  font-weight: 600;
}

/* ----- Feature list / tricks ----- */
.vea4-list { list-style: none; padding: 0; margin: 0; }
.vea4-list li {
  padding: 0.9rem 0; border-bottom: 1px dashed var(--vea4-line);
  display: flex; gap: 0.8rem; align-items: flex-start;
}
.vea4-list li i { color: var(--vea4-primary); margin-top: 0.2rem; }
.vea4-list li:last-child { border-bottom: none; }

/* ----- Testimonials ----- */
.vea4-quote {
  background: var(--vea4-surface); border-left: 3px solid var(--vea4-primary);
  border-radius: 10px; padding: 1rem 1.2rem; margin-bottom: 0.8rem;
}
.vea4-quote .vea4-stars { color: #ffcf4d; font-size: 1.1rem; margin-bottom: 0.3rem; }
.vea4-quote p { margin: 0 0 0.4rem 0; font-size: 1.2rem; }
.vea4-quote .vea4-author { font-size: 1.05rem; color: var(--vea4-text-dim); }

/* ----- Winners strip ----- */
.vea4-winners {
  display: flex; gap: 0.6rem; overflow-x: auto; padding-bottom: 0.4rem;
  scrollbar-width: none;
}
.vea4-winners::-webkit-scrollbar { display: none; }
.vea4-winner {
  flex: 0 0 auto; min-width: 160px; padding: 0.8rem 1rem; border-radius: 10px;
  background: var(--vea4-surface); border: 1px solid var(--vea4-line);
}
.vea4-winner .vea4-amount { color: var(--vea4-primary); font-weight: 800; font-size: 1.3rem; }
.vea4-winner small { color: var(--vea4-text-dim); }

/* ----- Payment chips ----- */
.vea4-pay {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
}
.vea4-pay span {
  background: var(--vea4-surface); border: 1px solid var(--vea4-line);
  padding: 0.6rem 1rem; border-radius: 999px; font-size: 1.1rem;
  display: inline-flex; align-items: center; gap: 0.4rem;
}

/* ----- Promo inline link ----- */
.vea4-promo {
  color: var(--vea4-primary); font-weight: 700; cursor: pointer;
  border-bottom: 1px dashed currentColor;
}
.vea4-cta { margin: 2rem 0; text-align: center; }
.vea4-cta .vea4-btn { min-width: 80%; }

/* ----- Footer ----- */
.vea4-footer {
  margin-top: 2.5rem; padding: 2rem 0 6rem 0;
  border-top: 1px solid var(--vea4-line);
  background: linear-gradient(180deg, transparent, rgba(255,20,147,0.05));
}
.vea4-footer-brand { font-size: 1.2rem; color: var(--vea4-text-dim); margin-bottom: 1rem; }
.vea4-footer-links {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.6rem; margin-bottom: 1.2rem;
}
.vea4-footer-links a {
  padding: 0.6rem 0.2rem; font-size: 1.15rem; color: var(--vea4-text);
  border-bottom: 1px solid var(--vea4-line);
}
.vea4-footer-promos {
  display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.8rem 0 1.4rem 0;
}
.vea4-footer-copy { font-size: 1.05rem; color: var(--vea4-text-dim); }

/* ----- Bottom nav (mobile only) ----- */
.vea4-bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 1000;
  height: 60px;
  background: linear-gradient(180deg, #15151a, #0b0b0e);
  border-top: 1px solid var(--vea4-line);
  display: flex; justify-content: space-around; align-items: center;
  padding: 0 0.3rem;
}
.vea4-bottomnav a {
  flex: 1; min-width: 60px; min-height: 60px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.2rem; color: var(--vea4-text-dim); font-size: 1rem; font-weight: 600;
  transition: color 0.18s ease, transform 0.18s ease;
}
.vea4-bottomnav a i { font-size: 22px; }
.vea4-bottomnav a:active { transform: scale(0.9); }
.vea4-bottomnav a.vea4-current,
.vea4-bottomnav a:hover { color: var(--vea4-primary); }
.vea4-bottomnav .vea4-badge {
  position: absolute; top: 8px; transform: translateX(14px);
  background: var(--vea4-primary-2); color: #fff; font-size: 0.85rem;
  min-width: 16px; height: 16px; padding: 0 4px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center; font-weight: 700;
}

/* ----- Reveal animation ----- */
.vea4-reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.vea4-reveal.vea4-in { opacity: 1; transform: none; }

/* ----- Desktop: hide bottom nav and center content ----- */
@media (min-width: 769px) {
  .vea4-bottomnav { display: none; }
  main { padding-bottom: 3rem; }
}
@media (max-width: 768px) {
  main { padding-bottom: 80px; }
}