/* --- BỐ CỤC TRẠM KHÍ TƯỢNG --- */
.weather-arena {
    height: 220px;
    box-shadow: inset 0 0 20px rgba(0,0,0,0.3);
    position: relative; 
    overflow: hidden;
    transition: background 1s ease; /* Hiệu ứng chuyển màu mượt mà */
}

/* Khu vực gắn nhiệt kế */
.thermo-wrapper {
    position: absolute;
    top: 50%; left: 55%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 2;
}

/* Khung nhiệt kế */
.thermometer {
    position: relative;
    width: 30px;
    height: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
}

/* Ống thủy tinh */
.glass-tube {
    width: 14px;
    height: 110px;
    background: rgba(255, 255, 255, 0.8);
    border: 2px solid #90a4ae;
    border-bottom: none;
    border-radius: 10px 10px 0 0;
    position: relative;
    z-index: 3;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

/* Các vạch chia độ trên ống */
.glass-tube::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 8px,
        #546e7a 8px,
        #546e7a 10px
    );
    z-index: 5;
}

/* Cột chất lỏng màu đỏ (Thủy ngân/Cồn) */
.liquid-red {
    width: 100%;
    background: linear-gradient(90deg, #e53935 0%, #f44336 50%, #c62828 100%);
    transition: height 1.5s cubic-bezier(0.25, 1, 0.5, 1);
    z-index: 4;
}

/* Bầu chứa bên dưới */
.bulb-base {
    width: 30px;
    height: 30px;
    background: radial-gradient(circle at 10px 10px, #f44336, #c62828);
    border: 2px solid #90a4ae;
    border-radius: 50%;
    margin-top: -5px;
    z-index: 2;
    box-shadow: 0 4px 5px rgba(0,0,0,0.3);
}

/* Hiệu ứng khi trả lời đúng */
.glow-success {
    animation: pulse-thermo 1s ease-out forwards;
}
@keyframes pulse-thermo {
    0%, 100% { filter: drop-shadow(0 0 0 rgba(0,0,0,0)); }
    50% { filter: drop-shadow(0 0 15px #fff) brightness(1.2); }
}

/* Nhân vật Chuyên gia khí tượng */
.weatherman-char {
    position: absolute;
    bottom: 20px;
    left: 15%;
    font-size: 4.5rem;
    z-index: 5;
    filter: drop-shadow(3px 5px 4px rgba(0,0,0,0.4));
    transition: all 0.3s ease;
}

/* Nhảy mừng */
.happy-jump {
    animation: build-jump 0.8s ease-out forwards !important;
}
@keyframes build-jump {
    0% { transform: translateY(0); }
    50% { transform: translateY(-30px) scale(1.1); }
    100% { transform: translateY(0); }
}

/* Rung lắc khi sai */
.shake-error { animation: shake-char 0.4s !important; }
@keyframes shake-char {
    0% { transform: translateX(0); }
    25% { transform: translateX(-15px) rotate(-10deg); }
    50% { transform: translateX(15px) rotate(10deg); }
    75% { transform: translateX(-15px) rotate(-10deg); }
    100% { transform: translateX(0); }
}

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