/* Khung tuyết rơi chiếm full màn hình */
.snow {
  pointer-events: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  z-index: 1;  /* để dưới ông già + popup */
}

.snow span {
  position: absolute;
  top: -10%;                /* bắt đầu trên mép trên */
  color: #ffffff;
  opacity: 0.9;
  animation: fall linear infinite;
}

/* Animation rơi từ trên xuống dưới */
@keyframes fall {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(120vh);
  }
}

/* ===== SANTA CHẠY + Ô KHUYẾN MÃI ===== */
.santa-wrapper {
    position: fixed;
    top: 50%;
    left: 100%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 9999;
    animation: santaMove 4.5s linear forwards;
}

@keyframes santaMove {
    0% {
        transform: translate(0, -50%);
    }

    100% {
        transform: translate(-55vw, -50%);
    }
}

.santa-run {
    width: 170px;
    height: auto;
    display: block;
}

/* Ô ưu đãi Noel */
.promo-box {
    position: relative;
    width: 260px;
    padding: 16px 18px 14px;
    border-radius: 14px;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(255, 255, 255, 0.22);
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.7);

    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.promo-box.show {
    opacity: 1;
    transform: translateY(0);
}

/* Nút đóng X */
.promo-close {
    position: absolute;
    top: 6px;
    right: 8px;
    border: none;
    background: transparent;
    color: #e5e7eb;
    font-size: 18px;
    cursor: pointer;
}

.promo-close:hover {
    color: #ffffff;
}

.promo-box h3 {
    font-size: 18px;
    margin-bottom: 6px;
    color: #ffffff;
}

.promo-box p {
    font-size: 14px;
    margin-bottom: 10px;
    color: #f9fafb;
    line-height: 1.5;
}

.promo-box p strong {
    color: #facc15;
}

.promo-input {
    width: 100%;
    padding: 8px 10px;
    border-radius: 6px;
    border: none;
    margin-bottom: 10px;
    font-size: 14px;
    outline: none;
}

.promo-btn {
    width: 100%;
    padding: 9px 10px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #f9d976, #f39c12);
    color: #111827;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.promo-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.7);
}

.promo-note {
    margin-top: 6px;
    font-size: 12px;
    color: #cbd5f5;
}

/* Mobile chỉnh lại chút */
@media (max-width: 600px) {
    .santa-wrapper {
        gap: 10px;
        animation: santaMoveMobile 4.5s linear forwards;
    }

    @keyframes santaMoveMobile {
        0% {
            transform: translate(0, -50%);
        }

        100% {
            transform: translate(-70vw, -50%);
        }
    }

    .santa-run {
        width: 140px;
    }

    .promo-box {
        width: 220px;
        padding: 14px 14px 12px;
    }
}