/* Đường đua */
.track-container {
    height: 140px;
    background-color: #424242; /* Màu nhựa đường */
    box-shadow: inset 0 10px 20px rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
}

/* Vạch đứt giữa đường di chuyển liên tục */
.lane-divider {
    position: absolute;
    width: 200%;
    height: 8px;
    background-image: linear-gradient(90deg, transparent 50%, #fff 50%);
    background-size: 80px 10px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.7;
    animation: move-track 1s linear infinite;
}

@keyframes move-track {
    0% { transform: translate(0, -50%); }
    100% { transform: translate(-80px, -50%); }
}

/* Vạch đích */
.finish-line {
    position: absolute;
    right: 2%;
    font-size: 3.5rem;
    z-index: 2;
    top: 50%;
    transform: translateY(-50%);
    filter: drop-shadow(2px 2px 2px rgba(0,0,0,0.5));
}

/* Xe đua */
.race-car {
    position: absolute;
    left: 2%; 
    font-size: 3.5rem;
    z-index: 3;
    top: 50%;
    transform: translateY(-50%);
    transition: left 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
    filter: drop-shadow(4px 4px 5px rgba(0,0,0,0.6));
}

/* Khói xe báo lỗi */
.exhaust-smoke {
    position: absolute;
    font-size: 2rem;
    z-index: 2;
    margin-left: -35px;
    margin-top: 10px;
    animation: fade-up 1s forwards;
}

@keyframes fade-up {
    0% { opacity: 1; transform: translateY(0) scale(1); }
    100% { opacity: 0; transform: translateY(-20px) scale(1.5); }
}

/* Rung lắc khi sai */
.shake-error { animation: shake-car 0.4s; }
@keyframes shake-car {
    0% { transform: translateY(-50%) translateX(0); }
    25% { transform: translateY(-50%) translateX(-8px) rotate(-5deg); }
    50% { transform: translateY(-50%) translateX(8px) rotate(5deg); }
    75% { transform: translateY(-50%) translateX(-8px) rotate(-5deg); }
    100% { transform: translateY(-50%) translateX(0); }
}

.min-h-75 { min-height: 85px; }

/* Highlight số liệu */
.hl-red { color: #dc3545; font-weight: 900; }
.hl-blue { color: #0d6efd; font-weight: 900; }