/* --- BỐ CỤC KHO BẠC NGÂN HÀNG --- */
.vault-arena {
    height: 180px;
    background: radial-gradient(circle at 50% 50%, #424242 0%, #212121 100%); /* Màu xám kim loại */
    box-shadow: inset 0 0 30px #000000;
    position: relative;
    overflow: hidden;
    border: 6px solid #616161; /* Khung cửa két sắt */
    border-radius: 20px;
}

/* Ánh sáng lazer quét bảo vệ */
.security-laser {
    position: absolute;
    width: 2px;
    height: 100%;
    background-color: #ff1744;
    box-shadow: 0 0 10px #ff1744, 0 0 20px #ff1744;
    left: -10px;
    animation: sweep-laser 4s infinite alternate ease-in-out;
    z-index: 2;
    opacity: 0.7;
}
@keyframes sweep-laser {
    0% { left: 0%; opacity: 0.2; }
    50% { opacity: 0.8; }
    100% { left: 100%; opacity: 0.2; }
}

/* Cửa két sắt trung tâm */
.vault-door {
    position: absolute;
    left: 45%;
    top: 35%;
    font-size: 4.5rem;
    z-index: 4;
    transition: all 0.4s ease;
    filter: drop-shadow(0 5px 10px rgba(0,0,0,0.8));
}

/* Hiệu ứng xoay mở cửa */
.unlock-door {
    animation: open-vault 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
@keyframes open-vault {
    0% { transform: rotate(0deg) scale(1); opacity: 1; }
    50% { transform: rotate(180deg) scale(1.2); }
    100% { transform: rotate(360deg) scale(0.5); opacity: 0; }
}

/* Báo động khi nhập sai (Rung và đỏ lên) */
.shake-alarm { 
    animation: alarm-ring 0.3s infinite; 
    filter: drop-shadow(0 0 15px #ff1744) !important;
}
@keyframes alarm-ring {
    0% { transform: translate(0) scale(1.1); }
    25% { transform: translate(-5px, 5px); }
    50% { transform: translate(5px, -5px); }
    75% { transform: translate(-5px, -5px); }
    100% { transform: translate(0) scale(1.1); }
}

/* Vàng lộ ra bên trong */
.gold-bars {
    position: absolute;
    left: 42%;
    top: 38%;
    font-size: 4rem;
    z-index: 3;
    opacity: 0;
}
.shine-gold {
    animation: gold-reveal 0.5s ease-out forwards;
}
@keyframes gold-reveal {
    0% { opacity: 0; transform: scale(0.8); filter: brightness(0.5); }
    100% { opacity: 1; transform: scale(1); filter: drop-shadow(0 0 15px #ffd54f) brightness(1.2); }
}

.min-h-75 { min-height: 90px; }
.hl-num { color: #ffd54f; font-weight: 900; font-size: 1.2em; }