body {
  background: url('images/NENPC.png') no-repeat center top;
  background-size: cover;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}


.mobile-link-buttons {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 30px 0;
  align-items: center;
  width: 100%;
  max-width: 420px;
}

@keyframes rainbow-move {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.custom-link-btn {
  color: #fff;
  font-family: 'Arial Black', Arial, sans-serif;
  font-weight: bold;
  font-size: 22px;
  border-radius: 16px;
  box-shadow: 0 4px 24px #0003;
  padding: 18px 0;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
  justify-content: center;
  letter-spacing: 0.5px;
  border: 2px solid #ffd580;
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 420px;
  text-align: center;
  margin-bottom: 18px;
  background: linear-gradient(90deg,#383838,#292929); 
}

.custom-link-btn.purple {
  background: linear-gradient(90deg,#383838,#292929);
}

.custom-link-btn:hover {
    color: #ffda56;
    background: rgba(249, 187, 34, .4);
    filter: brightness(1.1) drop-shadow(0 0 8px #fff);
    transform: translateY(-2px) scale(1.04);
}

.mobile-title-logo {
  display: block;
  margin: 0 auto 40px auto;
  width: 420px;
  max-width: 100vw;
  height: auto;
}

.mobile-iphone-img {
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
}

/* Đảm bảo ảnh IPHONE to đúng ý */
.mobile-iphone-img-img {
  width: 900px;
  max-width: 90vw;
  display: block;
  margin: auto;
}

/* Layout 2 cột cho PC */
.pc-main-layout {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100vw;
  max-width: 1200px;
  margin: 0 auto;
  gap: 120px;
  background-size: cover;
}

.pc-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1 1 0;
  min-width: 400px;
}

.pc-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1 1 0;
  min-width: 400px;
  max-width: 500px;
  padding-left: 32px;
}

.mobile-iphone-img img {
  width:900px;
  max-width: 40vw;
  display: block;
  margin: auto;
}

.mobile-title-logo {
  display: block;
  margin: 0 auto 32px auto;
  width: 450px;
  max-width: 60vw;
  height: auto;
}

.mobile-link-buttons {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}

@media (max-width: 900px) {
  .pc-main-layout {
    flex-direction: column;
    gap: 18px;
  }
  .pc-left, .pc-right {
    min-width: unset;
    max-width: 100vw;
    align-items: center;
    justify-content: center;
  }
  .mobile-title-logo {
    margin: 20px auto 10px auto;
    width: 120px;
    max-width: 80vw;
  }
}